I never boarded the Figma train because I prefer the UI of Sketch, as well as its local-first approach and how its file format is publicly documented so I actually own my data. I do worry about it going under though, and if Apple buying it up is the only way for that to happen so be it.

If nothing else it'd keep it out of Adobe's hands which is worth a lot on its own.

I'm not sure what the value proposition of Sketch is these days apart from local, non-cloud editing (although you can even get that with a pretty decent UI these days with Lunacy).