xdg portal here is not gnome or gtk, it's kde it the screenshot are
- waybar
- alacritty
- btop
- zed
- dolphin
also installed are
- mako
- fuzzel
- and kde apps
I totally get your point but it really depends on what scope you define. For me, coming from Gnome and not feeling like constructing the whole shell aspect of my desktop myself, these tools do that job very well.