For eg. I installed Blur-glassy theme today to check with all options selected in my Fedora 40 installation. Still I needed to install the blur option separately and colors too. After everything still Dolphin and Discover do not look anything like the picture shown.
I have seen this while trying out many themes. They either partially deploy or sometimes not.
Is it because they were built for KDE 5 and this is 6 or something?
Complexity doesn’t imply inconsistency, but i hear you. Find a theme you like, and if it needs kvantum, then try it out, and if not, then don’t. It’s not like it’s required to enjoy Plasma