The bros can play pong Wednesday after work without others even knowing about it. What bros do out of work matters less, so they can be bros while more conservative colleague can go to church without someone being disadvantages for it. That is why I find it better.

As for happiness in lax company: it might make people happier if they get money and promotions while actually working less (while moving socialization and fun from home to office), but it is neither meritocracy nor fair. Regardless of whether they are bros or chatting over coffee.