The German divisions deployed in the west were not "only reserve units with poor training and not fully equipped". At the start of the war they had 12 x 1st wave divisions, 10 x 2nd wave divisions, 12 x 3rd & 4th wave divisions plus border troops that were around the equivalent of another 4 divisions. The first wave divisions were composed of the current conscripts engaged in full time service while the 2nd wave divisions were composed of those troops that had completed their 2 years conscription and had been back in civilian life for no more than 2 years. These troops were the equivalent of the better French Divisions and were equipped with more modern weapons, as Germany had to rebuild almost their entire armament inventory between the wars while the French relied on large stocks of WW1 equipment. The men in the other divisions had still had some military training prior to war breaking out, and were generally younger and fitter than those in the French B Reserve Divisions, while still on the whole enjoying a qualitative edge in equipment over those divisions. All the divisions were fully equipped as Germany had not mobilised all their manpower reserves prior to war breaking out. It was only with the raising of the 7th Wave Divisions in late 1939 that significant equipment shortages become apparent, with only 24 x 105mm howitzers & 36 x 37mm AT guns assigned to each of those divisions, compared to the 36 x 105mm, 12 x 150mm & 75 x 37mm of the 1st wave divisions.
The French may have been able to launch a 1939 offensive into Germany, but it would have come at the cost of high casualties, made slow progress and would have been vulnerable to counter attack by the German forces redeploying from Poland after the successful campaign there. The western strategy was to weaken Germany through blockade while raising, training and equipping more troops, especially British, so that a successful offensive could be launched later.
for german vs frogs infantry equpment - booth nations main infantry weapon was pre wwii rifle, for germans 98k meaned karabine model 1898, similiar for frogs, submachine guns were more or less equal for booth nations (booth modern designs, while geman one was little more reliable), artilery was again more or less equal (german ones were true modern build, but they were just modernized versions of older ones with no significian performance gain, just more user friendly), onlyest advantage that germans have were in machineguns , thier mg34 was way better that frogs have. yeah, some german tanks were better than frogs ones (well, only pz4, pz 1+2 was crap and somua was better than pz3) , but no tank division against frogs at that time, and main advantage of german tanks division was in tactic and comman, not tanks designs.
why you think that frogs will have problems to advance in 39 to germany if they REALY wanted ? based on thier real performance ? well, that was because 99% of all thier officers from colonel up should be shoted for defetism or incopetence. frogs realy have manpower and strengt to do it, if they have competent leadership, but they didnt.
problem was that brits or frogs didt realy wanted to fight germans, ever, not in 38,39 or other time. for brits greater and more powerfull germany meaned counterweight to france power and frogs were terrified by figting again against germans. stategy to weaken gemany thought blokade was idiotic and doomed to fail from begining, how can you blockade land locked nation which dont import anything important via sea which can be interecpet ? even for roal navy it was imposilbe to block imports from scandinavia to germany during whole war, and as bonus how can you block germany which can import resorces via neutral italy or purely by land via balkan states, turkey or soviet union ?
and now why frogs should crush germans in west fast if they realy wanted :
1. frogs should deploy against germany practicaly whole thier army, as they didnt needed to guard much boarders agains spain or italy (in 1940 they comited against germany 94 from 114 divions), and now compare using of these 94 divions to numbefrs actualy used in 39 "offensive"
yes, they should suffer great causalties, but in end, they will be far lower than suffered during whole war as it happened , instead of ending it in 39.
and that blockade thing was just excuse for ruling politicans to justify thier stupid pre-war policy of apasment to germany when they called any oposition which warned about hitlers theat as warmongers and alarmists. after all, you will need time to build army when in war, if you builded it in peace time to be ready right ?