Ask HN: Is there any reason (so far) to not upgrade to macOS Big Sur?

I'm still on Mojave, having delayed upgrading to this point because of the apparent instability and other issues that kept coming up with Catalina. I don't feel like that was a bad choice. With Big Sur, there's a shiny new set of UI revisions that seem pretty compelling, but I wonder, are there any significant reasons to just stick to Mojave?

(I don't plan on upgrading immediately anyway)