What many seems to forget is that you will get more troops from your AWs when your squadsize is bigger. If you got a lot of AWs producing troops at high level the amount of extra troops shouldn't be ignored.
Also your troop production queue is longer with bigger squadsizes, reducing time when the barracks are idle due to not beeing able to get into the game before the queue runs out.
first, your troop production queue doesnt get longer when you research a bigger squadsize. It only gets longer if you get a higher training size (more barracks or similar wonders).
second, its true you get more units from your unit producing AW, but those wonders became a bit less usefull with the coming of the brown bear. The amount of troops you can get out of those AW is low if you compare it with the effect of 1 brown bear and full trained queue.
and third, if you like tournaments, then you know that in 4 of the 6 fights you fight against and enemy with higher numbers then yours.
Lets take prov 20 for an example since that one is 100% your strenght.
So say your troop size grows with 100, that means in
round 1 the enemy gets 85 more units, round 2 the enemy gets 100 more, round 3 115, round 4 130 round 5 145 and finally round 6 160. So all rounds combined, you gained 600 more units, while the enemy gained 735. you have to multiply that with 5 since we fight with 5 troops (so 3000 vs 3675) and that you again have to multiply with 4 since it takes 4 fights for 1 province so 12000 vs 14700.
If you did 20 provinces, like we did in this example, then you have to multiply that number with 10, so in that case u used 120k units vs 147k units. And every province after 20 its gets a lot more expensive (like if you do 35 provinces, then you have do not x10 but x31)
And thats only for an increase of your SS of 100, now say you go for all out, and end up with about a squadsize of 3500. That means you would need 420k units for 20 provinces, while you fight 514,5K enemy units.