Overwatch doc is kinda stupid, but that's not rly a bad thing imo because it's the last reason why we don't see omega-boring Elite Armor doc every single match, so at least it brings a bit of variety.
And the door swings both ways for this "OP doc" argument. USF has airborne, Soviets have Guard Motor & Mechanized Support, Brits have Royal Engineers & Commandos, Wehrmacht has Jaeger Armor & Mechanized etc etc
its not really justified to defend a strong doctrine with another slightly stronger doctrine lmao
the tools that you get, combined with what you already have available, give you way too much options and variety in a single doctrine.
OW doctrine gives you more tools than the elite armor doc, so I wouldn't call it stronger after the ST nerf lol