I had the exact opposite experience. I starting using KDE 5 for both work and personal use about 6 months before bookworm became stable and have been extremely happy with it ever since. And I say this as someone who is typically very critical of the roughshod nature of Linux desktop environments. (Namely: every time we have something good, a person or team comes along and wants to rewrite it in their image. Hopefully the KDE devs can stay the course this time and adhere to evolutionary rather than revolutionary growth.)