Ubuntu in ~2015 was peak Linux (for me). Everything worked flawlessly with zero bugs, even printers. It’s been downhill ever since with the exception of Steam Proton, but even then I’ve had more bugs with Steam in the past couple years then I did in 2013.
“Finished” is a relative concept that dependa on an individuals needs and wants. I don’t care about HDR. I’ve been able to play every game I want virtually without a hassle for more than a decade. Wayland is nice but ultimately I don’t care.
Linux has been finished for me since some time between 2011-2014.