It's not a default but I just changed it to tabbed view in the settings, picked Sifr icons in the settings, and installed adw-gtk3 theme on GNOME which makes gtk3 apps blend more with the default libadwaita GNOME theme.
I was on Ubuntu for a year. No major issues, although I used the interim releases, which are supposed to be less solid than LTS. Then, a couple of months ago, I decided to switch to Fedora, just out of curiosity. Many people stated how Fedora is rock solid, Fedora is the new Ubuntu, etc. First some rpmfussion updates broke mesa, then the ostree update broke Flatpak, and recently there was a broken kernel 6.3.11 update that affected some AMD users. A few days ago, I updated my kernel to 6.3.12, and I got frequent freezes on boot. Other users are also reporting such issues. So now I boot with an older kernel. Which is not optimal. There is no LTS kernel on Fedora, the old kernel version doesn't receive security updates. Was it always like that, or it's an unusual bad phase.
IMHO, Debian is not the best choice for KDE, especially if you are on Wayland. KDE is a bit more buggy than GNOME, but bugs are fixed constantly at a fast pace, and Wayland support gets better. With Debian, you are stuck with the old version and have to wait 2 years for bugfixes. Kubuntu would be a better pick since it has interim releases with more recent KDE and also official backports with fresher KDE version.
Better tools for graphic design. Maybe a port of the Affinity suite or a big push towards GIMP, Inkscape, and Scribus development. GIMP... I feel like people dreamed for more than a decade for essential photo editor functionalities like CMYK support and non-destructive editing. At least the first one is coming in the next version(partially).