Its improved a lot. Ubuntu 21.04 is really great and runs very well on my Dell XPS 13. However, there are constant issues which make it tough for daily use. For example, Bluetooth is really flaky still. If I try to connect headphones they'll invariably stop working before long.

And as the author notes, there are a bunch of apps that just aren't available, WINE has never worked for me, etc. I run a Win7 VM for some of this but it's still a pain.

I agree Win 10 + WSL2 is hard to beat.