Personnaly I use TuxedoOS on my main machine (which is a Tuxedo …) It is close to KDE Neon (use theyre repo) but stable (realy) with test and QA.
I only use KDE Neon as a test for new stuff on a test machine: in fact I have multi-boot with KDE Testing and Unstable. To be fair until recently KDE Neon denide to even be a distro. I don’t think it was the 1st idea. More a platform to devs and to test new stuff not for every day end-user. At list is how I see it but I started using it quite recently.
As a side note I also used App Daskboard, but it was planed to be drop with plasma6 apparently it posed some problem to maintain. As replacement the idea is to use kickoff resized (it can be resized but not fullscreen know) or there is a fullscreen app launcher in widget store.
https://discuss.kde.org/t/fullscreen-kickoff/4281/17
https://invent.kde.org/plasma/plasma-desktop/-/issues/105
The fullscreen app Launchpad as a plasma6 menu but I don’t use it right now. It is nice and work but something bother me: the code in the link to the github doesn’t match the widget (the github is outdated).
https://store.kde.org/p/2174238