> There will always be employees who want to do a bit of extra, stay a bit longer, answer emails at 10pm, to help make progress in their career and get promotions.

Additional work should not help getting promotions/a raise, but only a one-time bonus (proportional to the overtime/achievement): - if the person stops overtime after that, (s)he will continue to enjoy the rise forever. - working more does not help by itself to go to the next level (being more productive, getting new skills allowing to transition to another role) - (it's even more toxic when stacked ranking is put it place: those who work "normal" hours will almost never get a raise/promotion).