politics

There are ways to justify this (decreasing marginal tax rates are consistent with optimal tax theory, as you get the incentive effect without the reduction in revenue on the hours that people would work anyway), but in general I'm kinda worried about tax policy being driven by memetics. Becomes a complexity nightmare.

why are you worried?
would you prefer he didn’t end all taxes on overtime pay?

Companies would start pretending all of their employees are working 60h/week and get a third of their pay tax free. Feels like a surveillance nightmare to fight against that.