You could technically do that but then you’d have to keep paying taxes to Germany on your income in the other country. And the other country will consider you a resident too and will want a chunk of that…

Welcome to americans' reality! It's actually more humane than the way US treats its overseas citizens - no onerous PFIC/FATCA, and you have an option to divorce the tax system while still keeping your passport.

Double taxation should be taken care of by tax treaties. Usually you'd pay the maximum of the two tax rates in total, with your current residence country getting first dibs.

Double win!