So the thing with Debian and any Debian based distro like Ubuntu or Linux Mint is there is no big centralized software repo like the AUR. Yes there is the apt repository but if you want something that’s not in there, get ready to read the documentation or follow random guides.
For example, one of my friends wanted to download an audio tool called Reaper. On Windows this is just looking up the application and clicking on the .exe. It really depends on the dev if they include a .deb, sometimes you might need to download the .sh file or they may tell you to compile it yourself. Perhaps, you have to add a ppa. On Arch, all I have to do is Paru -S Reaper, if there are multiple Reapers I can look for that by typing Paru Reaper.
Now that Arch is so easy to install with the Archscript, and the software repo so vast and easy to use, is Debian really user friendly if you have to jump through several hoops to download programs?
Edit: yeah yeah there’s flathub and stuff but that’s more of a last resort, optimally, you want to get it the correct way.
What input method? Flatpaks have controllable permissions that can be changed by the user.
As for large sizes, that hasn’t been the case for a while. The stuff that takes up the most space are libraries and they installed once. Usually a program will need either the KDE framework (for qt) or the gnome framework (gtk).