I love Poetry. It's better than pipenv. Both are better UX than manually creating virtual environments. It's also more than just a dependency management system. It does packaging and publishing. It's better than setup.py and twine and such at that.
I'm always baffled when people say the opposite. There's the matter of pure personal preference, which I accept. The bigger issue I have is with people who have been doing it their own way and will find any number of little reasons to reject anything new.
This guy finds three bugs when he first used it, but all of them look like minor things to me. Complaining about 50 dependencies in 2022 seems silly. Caret versioning as default is personal preference and not an unreasonable choice.
His argument about the 5% chance of failure is the only thing that I find as a strong point. I don't agree with the developer's decision, but it's a deprecated way to install poetry, so I understand.