i think reinforcements was the right way to go instead of mods. I do think they made a mistake with falcon's rng assist, I've had days where nothing could stop me and other days where I'm lucky to win 2 out of 5 just because of that rng assist.
I'm not a fan of the 3v3 format because it largely renders reinforcements for the underdog moot. Like i could come back from a 5v4 with the right tactics. 3v2 though is really hard to come back from, especially in the current meta where the falcon basically ensures you other remaining ship gets focused hard to make it a 3v1.
I also don't feel some ships have kits that fit in a 3v3 format. Almost all support ships since the kit almost relies on 3-4 other ships being in play. Likewise some kits like Vader that were/are devistating when you get 3-4 other target lock applying/benediting ships but doesn't bring much to a 3v3.
Ultimates also felt more ultimate in 5v5 and could swing a match in your favor. Now if you get to it at all it's just a "eh i already won but i guess i should use it" or "too little too late to give me a chance at a win."