Years ago I tried running Debian on my desktop computer and it became very quickly apparent it was not suited to my needs because of the out-of-date software. These days I only really consider rolling release distros for my desktop, or at least something with a fairly snappy release schedule. If I went for Debian, I’d probably run sid or testing.
Now, in situations where the bleeding edge is not necessary, Debian is fantastic. I’ve run it on my laptop, Raspberry Pi server and PinePhone. On the laptop, having a solid base that doesn’t break if I don’t use it for a while was great, since I didn’t use that laptop often. I did use flatpaks for some applications that I really wanted to be more recent and it worked nicely. So yes, you can use Debian as a solid base and use Flatpaks/Appimages/other to run apps you really need the newest version of, where available of course.
Looks great! Where can I download this theme?