There are definitely bugs, and certain features are still to be added — as will definitely happen by way of the future maintenance releases. Also, the moving around of items within the System Settings is a bit illogical in some cases. But in my personal experience, Plasma 6 is a major improvement over Plasma 5, and this is not exactly the fastest or most recent machine on the block either.
This computer has now just turned 5 years old — literally about 6 weeks ago — and it was already not the latest & greatest hardware anymore when I bought it, because this is an 8th-generation Intel i5, and the 9th generation was already being sold, with the 10th generation scheduled to arrive within a few months.
It did originally come with only one 8-GiB memory module installed — which was twice the amount my previous computer had — and after about 6 months, I had a second 8-GiB module put in. So not only did I then have 16 GiB of RAM, but now I also had dual-channel memory access, which did noticeably improve the snappiness and application loading time.
However — and this cannot be repeated enough — it is imperative that one updates/upgrades the right way, and given that the upgrade from Plasma 5 to Plasma 6 was so incisive, that one does one’s research and makes one’s preparations before executing the upgrade, i.e.:
- removing all third-party widgets and applets;
- switching all theming components back to the upstream-default Breeze;
- logging out of Plasma completely;
- logging in at a
tty; - emptying
~/.cache/; - if necessary, renaming all
~/.config/plasma*files and~/.config/Trolltech.confwith a.baksuffix; - shutting down
sddmby way ofsystemctl; - refreshing one’s mirror list and running the update process with
pacman; - rebooting; and…
- after logging in again, dealing with one’s
.pacnewfiles.
The problem is that virtually nobody does it that way, or even pays any attention to the Announcements > Stable Updates announcement threads. 