AFAIK (mostly from storkesbury), there had been quite significant differences in how the germans would conduct an offensive (in 1917/8) as opposed to say the britons. For example, the british used heavy indisciminatory (rolling barrage) preliminary bombardment which precluded any breakthrough right from the beginning, as their troops would never be able to pass the resulting quagmire faster than the attacked would bring in his reserves - well until tanks en-masse that is. They opted, in short, for mass. While, otoh, the germans were more about surprise in their offensives. They consciously tried to keep prelimary bombardment as short and targetted (spotting of enemy arti, first) as possible in order to not give the attack away weeks before it actually jumped off.
Sorry; but that's one of the 'debunked myths' the OP goes on about.
First, a rolling (or creeping) barrage is the exact opposite of a indiscriminatory bombardment. A rolling barrage means you aim the guns at the enemy front line trench, then as your own troops advance the guns gradually lift their aim and lay down a moving curtain of explosions just in front of your advancing troops, moving forward at walking pace. This provides a moving barrier to suppress the enemy and prevent reinforcements coming up to counter-attack your advancing troops.
A rolling barrage needs extremely accurate gunfire, and both artillerymen and infantry who are very experienced and well-trained. For one thing, it need a lot of trust by the infantry that the gunners are going to keep the barrage moving forward at the right speed, and not let any of their shells fall short and land among the infantry walking just behind the line of explosions.
The rolling barrage was invented by the French Army, as far as I know - the word 'barrage' is French. The British copied them, but in the first half of the war their artillery wasn't good enough to make it a regular feature of their attacks. By 1917-18, though, the much more experienced British Army was able to employ rolling barrages frequently.
Fireplans often involved elaborate combinations of barrages. There might be a creeping barrage ahead of the troops and a standing barrage on the rear-line trench to block reinforcements. There might be a box barrage, shelling the sides of the advance to prevent a flank counter-attack. There might be a back barrage, when the line of shells creeping forward would suddenly, at a pre-planned moment, change direction and return back towards the advancing troops - so any Germans who thought they could shelter in their dugouts while the barrage went past then rush out to the parapet to fight off the advancing British would instead be caught in the back barrage.
The idea of the hurricane barrage, a sudden surprise attack by massed artillery intended to stun and suppress the enemy, was also well-known to the British, and in 1917-18 they frequently employed it. The battles of Cambrai and Amiens are the most famous examples. In fact, the British proved to be even better at this strategy than the Germans, because their guns tended to be newer and more accurate. By 1918 the German heavy artillery was worn out, and attempts to launch a surprise attack with no initial ranging shots often missed their target. The British didn't have that problem - and indeed, by that time they were also using sound ranging, aerial reconnaissance and pre-registered guns to achieve even greater surprise and accuracy.
The idea of pre-planning an offensive in detail, with specific troops assigned to particular offensives and even practicing the attack in advance using a mock-up of the enemy trenches, is also something that every army did. They might not all have been conscientious about it - Brusilov is famous because he spent much more time and care than was usual planning his offensive in 1916 - but it wasn't some incredible innovation that nobody had thought of before then.
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The problem, it seems to me, is that there was one particular British offensive - the Somme in July 1916 - where the British did rely on a mass bombardment for a week before the attack, losing all element of surprise and failing to destroy the enemy front lines. The Somme was a famous disaster - but people like the author you quote apparently believe that the British went on repeating the exact same tactic in every battle they fought for the next two and a half years, without ever learning from their mistake or changing their doctrine.
That is, quite simply, nonsense, as a brief look at the evidence would show. Unfortunately, it feeds into the popular stereotype that the British army were bumbling, shortsighted 'lions led by donkeys' while the Germans were all elite Aryan stormtroopers inventing Blitzkrieg 20 years in advance. The Germans are given credit for introducing 'innovative new tactics' in 1918 which were actually things the British and French had been doing as routine for the last year or so.
There is one thing I will give the Germans credit for - they were much more systematic and efficient in implementing the new doctrines and tactics in the winter of 1917-18. The British and French had been muddling through improving their tactics through trial and error for a couple of years. That led to significant differences between units; one division might have an innovative commander who trained his men in the new infiltration and bombardment tactics, while another one stuck to the same old drills and a third experimented with different tactics entirely.
The Germans, by contrast, because they knew they were going to launch their first big offensive in the West for two years in the Spring, studied the enemy tactics, decided on best practice then carefully circulated the new doctrines and trained their troops to use them, making sure everybody was working from the same page. (Unfortunately, as I mentioned before, they gave the new training to elite stormtrooper battalions, which they then threw into the fiercest fighting and got them killed, so by summer 1918 the German Army had lost most of its best and most experienced men.)