One thing I hate about WinForms:

"do not modify the contents of this method with the code editor."

How the phook do I add eventhandlers without adding them in the code? By some mysterious ways in the so called "designer"? Click and drag? Wearing a tie and talking to the computer? Making a phone call to Microsoft? Immersing into VR and ordering an event handler from a virtual store?

No, I've always just typed whatever I want to achieve and I'm going to do so whatever those know-it-all comments say in the auto-generated code.

You can call me a conservative old fart, but nothing beats writing my own code.