Because it's slow and difficult to use compared to sketch. Plus I need my files on my drive 100% of the time and routinely work without reliable network access.

I get kind of why Figma is popular, it solves issues with sharing and collaboration. But the day to day usage is crippled by the fact it's in a browser and not a standalone app where I need it to have total control over keybindings and shortcuts for my workflow. Meanwhile in the browser, hijacking that behavior is a UX antipattern.

Sketch is just so much less cumbersome than Figma it's not even funny. It's easier to use than illustrator and Xd too.

Ok that's fair. To add an opposing viewpoint, I've never noticed any slowdown with figma for the stuff I do. Then again, I don't use keybindings.