I think there is theory and there is real life. As tech worker, in 20 years career, in private sector, I have always been on forfait jours, working more than 10h/day on average, during many years weekend included. I never got paid extra hours. So I get what you say about the perception and the law. The French law is protective (i.e if I can prove that in a court I'll get my extra hours paid for sure but my career would end. Period.

This is not true. Government workers or factory workers can limit to 35h (with some salary loss or days off loss), but else than that (especially in tech) it is very competitive and working 50 hours+/week is not exceptionl.