Yes and no to all of those reasons, and many others.

There isn’t a right or wrong way to install/use Linux. As the saying goes “you do you”. If going through the Arch learning curve doesn’t appeal to you, don’t do it. If you’re the sort of person whose curiosity sometimes leads them to do silly things that aren’t necessarily logical but that you find enormously fun and satisfying, then maybe go for it.

Despite the K in its name, KiCad is nothing to do with the KDE project. It’s an independent program started (iirc) at a French university. I agree it’s awesome, though.