I’ve never worked in 2 countries but there are many countries that have DTA (https://www.iras.gov.sg/taxes/international-tax/internationa...) so theoretically you only pay taxes to one country at a time, wouldn’t it be simpler?
US screws its expats in a big way.
The club of countries that do this includes: United States, Eritrea and Myanmar.
P.S. My collection of board games is not particularly impressive for a board gamer: it's in the double digits, but not in the triple digits. I know some board gamers with far more games than I have.