and a reactionary union isn't really the way to fix "capital winning". Because the idea that capital "wins" is flawed imho. It's not that capital is winning, it's that capital is the part of the equation which has bargaining power.

The reason for that is hard to say, but i am guessing that most workers are not really unique or special enough to warrant having them the same bargaining power as capital. After all, capital is required to establish the job in the first place.

Forcing a union, to prevent capital from "winning" merely makes capital less effective at providing their function - investment and growth of the economy. This makes capital leave.