Say what you want but presidential democracies where presidents are elected by popular vote are a disaster for stability and democracy.
What's happening with this doing and undoing in the US (or Russia, Belarus, Hungary and countless other presidential republics) fully displays why this is a terrible political system:
1. Winner takes all. You may have been voted by 50% + 1 (even less) citizens but the other half is totally not represented like in a parliament.
2. No parliament/party that you need to have backing of. In a parliamentary democracy the prime minister won't just lose opposition's votes, but has to govern in a way that its own party won't boot you.
3. Single person can claim popular mandate. Often in opposition to the parliament/senate whatever. So you end up in situations like the disaster in Poland where government and president are from different parties and the government gets vetoed everything.
4. Extremely hard to remove. A prime minister is a vote of no confidence away from losing its seat. The president can ask them to resign in extreme situations. A president? Removing them is beyond difficult.
Honestly this is such an obvious disaster to have people vote for a president rather than a parliamentary prime minister.
The last parliamentary democracy to turn authoritarian has been Sri Lanka 50+ years ago. It's very hard to get so bad so fast in parliamentary republics.
Honestly I can't comprehend Americans thinking their constitution is some holy grail. It's old and has been written centuries ago without all the experience we have in modern democracies. Eastern Europe too has made very bad choices with similar setups and democratically elected presidents.
Say what you want but Germany or Italy have built in way more resilience to these absurdities by having the parliament elect the president which forces them to elect mostly neutral unbiased figures that will support and oversee whoever ends up being in government.