Stacking boni, whereever you getbthem for the purpose you want. You seem like an superior firepower guy, id like to se me as an mobile warfare one 
Is that terrain penalty really that harsh? I'm artillery lover, so my marines got two line arty, and they still had bonuses to fight in almost every type of terrain. i mean, of course its better to have +20% than +10%, but its also better to have +60 SA and full support brigade than +20 SA.I only use support AT and Arty with specialized units like mountain, marine
Is that terrain penalty really that harsh? I'm artillery lover, so my marines got two line arty, and they still had bonuses to fight in almost every type of terrain. i mean, of course its better to have +20% than +10%, but its also better to have +60 SA and full support brigade than +20 SA.
And trading a little bit of SA for better reenforcement is worth, better to bring your 250 sa in by hour 2 then your 280 by hour 4.
This is 100% wrong. Not to be offensive, but your view on signal companies being useful demonstrates a complete lack of awareness of the game mechanics.
If you need to cycle troops in a static meat grinder situation you do it manually anyways before your units hit 0 Org. So if 4 divisions fill the frontage, and you have 8 divisions to attack with you manually send in the first 4, and only 4. Once your divisions hit some 20% org you cancle the attack, and immediately attack with your other 4 divisions. Mechanically in game terms there's no change to the amount of time it takes to break the enemy, but this way you never deal with a reinforcement time delay, and more importantly you don't let your troops hit 0 Org and risk having them get bounced out piecemeal.
Defending is the same structure, but a little more timing sensitive. You need to position troops two provinces deep if you are defending against a troop concentration that exceeds provincial combat width. Once your defending troops get close to zero Org, you start a spoiling attack from a neighbouring province to hold the attacking troops. They you manually retreat the low Org troops and cycle forward your fresh troops from the 2nd line.
If you're dealing with a wide front attack and cannot use your neighbouring provinces to launch spoiling attacks, then you start marching your troops forwards before retreating. Just before your troops arive to reenforce, you retreat your front line troops. This breaks the combat cycle in the game engine and the advancing enemy starts a new combat with your fresh troops.
So I will always take better division combat stats that erode your troops Org faster and manually cycle troops in critical areas over allowing the AI to blindly smash troop concentrations together while grunting Zug Zug Zug. Signal companies are utter trash.
This whole screed completely ignores a lot of different mechanics in which reinforcement isn't simply "piling men into the meat grinder".
If you've gotten a tactic which suddenly gives you 25% more frontage, the faster it gets filled, the better. If your enemy adds a direction, and thus more frontage, the faster it gets filled, the better.
Even in your manually cycling divisions, when divisions are added to a combat in question, they enter as reserves, not in the front line. Until they come in, there are fewer targets that can be shot at in the front line and they'll take more damage. End result, you'll have to have more divisions to cycle in and out. Unless you break off the combat and start a new one, in which case you're resetting movement in the movement-is-combat mechanic.
The problem with this whole mindset is the complete undervaluation of soft stats. Recon gets you better tactics, increasing your damage and decreasing the enemy's, especially if you get the counter. Reinforcement happens in situations other than divisions breaking.
Soft stat support companies are force multipliers. They are far from useless. They are not an either/or, they are an and. IC per gun, I'd rather take a soft stat support company over AT or Art any day of the week, with the exceptions I've mentioned in this thread already.
Realy? i havent noticed any effect of recon on tactics. Probably its bugged and dosent work.The problem with this whole mindset is the complete undervaluation of soft stats. Recon gets you better tactics, increasing your damage and decreasing the enemy's, especially if you get the counter.
It doubles the bonus you have with radio from 7% to about 14%Is signal worth using? I've never felt the small reinforce rate is important. Radio gives so much already. Troops already get into the battle very fast.
Realy? i havent noticed any effect of recon on tactics. Probably its bugged and dosent work.
Not gonna get into the signal company debate, but recon really are useless. I have yet to see any statistical proof that the recon stat works. Ive documented close to a dozen other bugs already. I never get a response from a dev despite showing concrete proof that something isn't working correctly. I haven't run any tests yet but in all of my experiences so far having higher recon either does not change the chance to pick a counter tactic or the chance is so miniscule that it's useless. Until someone does a test and proves otherwise everything people say on the forums is just heresay bassd on what the devs want you to believe. Unfortunately it's been proven unequivocally that what they want you to believe and what's actually going on under the hood are two different realities.
It doubles the bonus you have with radio from 7% to about 14%
But that's late game signalists right? I just don't feel what the reinforce rate is supposed to do. In what situations are they good? I never feel that battles are short enough for reinforce rate to matter. Most battles continue for days and if a reserve reinforces at 04.00 or 07.00 doesn't matter at all.