Mine is that the useState hook is an actual plague on the entire React ecosystem. Regardless of your opinions of React, if you wanna use something then use it right.
It's funny how any dynamically typed language inevitably reverts back to static typing to manage chaos.
Poetry is the best of the bunch but that's also a massive contributing factor to Python's chaos. There are like 6 competing ways to set a python project up and despite having all 6 installed on your machine at all times, you still need to install their specific versions of things to get their project to work...
It's like someone looked at how fast avacados and bananas go bad after lasting a while, and was inspired to make a development environment that did the exact same.