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 pretty useful for text editing, but for any more serious code work I prefer to use an actual IDE.
As far as software development, Vim seems to me like an excellent solution for an irrelevant problem (typing speed).
Also, it's great that it's lightweight, but I bought the entire RAM and I'm going to use the entire RAM :P