This reddit post captures what I've seen at TSMC in Taiwan. $120K is normal pay at the director level...engineers make $2500-5000 a month. TSMC AZ starting pay for a new college grad w/ BS is probably just under $100K/year with just salary, with the potential to make over $120K within a few years with full vested bonuses.
I think your numbers match what my cousin shared. In both my conversations with my cousin and in the reddit post, it is unclear if reported salaries are take-home or don't include the OT and bonuses, but I don't get your point?
My point is: Engineers in Taiwan work more hours because they are paid to work more hours (OT). Engineers in the USA are not paid more if they work 35 hours or 60 hours.
If TSMC wants to address the culture gap (get the Americans to work more), TSMC should pay up.
He admitted, even with their OT and bonuses, he probably makes more than them w2 salaries.
But my point still remains: if they want US (or TW) folks to work more hours, they need to pay for those hours.