It's not how you "normally" install stuff on Windows or Mac either. But often times the software you need isn't available in a package manager. If everything was available as a flatpak I would take it all back, but that doesn't even remotely resemble reality.

I find that faster and easier than using a GUI

It is neither of those things. Objectively.

the GUI option is there and dead simple and easy for people who can't be asked to learn how to use the most basic tools on their computer.

The phrase you're looking for is "can't be arsed" but you're wrong anyway. The problem is not that we "can't be arsed", the problem is that it's an unnecessarily convoluted and unintuitive process.