You will find all sorts of settings in there, mouse pointers, GTK themes, window borders, custom colors, fonts, and much more.
PS: If you ever wanted your Pi to look exactly like a Windows 10 PC, check out my custom-made theme here.
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Pi-Apps also includes Zoom, Visual Studio, Tor browser, Windows 10 theme, and 33 more. Over 50,000 users!
If your unsatisfied then start over using the lite version of rpi os then install a desktop environment like cinnamon or mate for example
Running either Raspberry Pi OS desktop Full or Raspberry Pi OS MATE desktop
Overclocked at 2200MHz CPU and 700 MHz GPU with a over voltage of 7 Think before you delete something a stranger on the internet told you to.
LXDE was likely chosen as it is a fairly light weight and simple desktop. This made a lot of sense given the cpus in earlier Pis. The 3B+ does fairly well with a more robust desktop, and the 4B has no issues with most of the standard Linux desktops. I am not convinced about how a full blown KDE setup with all the eye candy would fair, but MATE and Cinnamon run very well. I don't particularly like LXDE, and only run it on my testbench Pi. All my desktop Pis run MATE.
Even within the confines of LXDE you can make the desktop much more visually appealing and certainly find lost of dark themes.