KDE prioritizes features and customization over stability and out of the box experience.
I mean, the fact that the very new major release of KDE almost hadn't added new features and focused on a rather smooth upgrade kinda proves otherwise.
KDE has tons of customization which is great for people who want to rice. Back in the day I was into ricing and DIY Linux. However, KDE is a poor choice for a mainstream workstation as there are way to many configuration options which leads to everything getting buried. It also doesn't look as nice out of the box.
I think the KDE spin is great for those who want to customize. For everyone else there is gnome and its derivatives
Exactly. While I love Plasma for what it is, I also don't love certain things like lack of polish, stability etc. Again no offense. Fedora Workstation aims to be a stable OS with sensible defaults for wider audience including home users, disabled people and developers who want to get things done rather than tweaking their OS. GNOME may not have great customizability as Plasma but it is stable and well polished for average user.