Honestly, you keep making the same circular argument. You would prefer to not need spare parts, yet 'everything breaks eventually of course.' In the world of parts availability, one is none, and two is one... that's why I have 3 Kahr CW9's (my basic carry piece.) That's why I have, more or less, enough AR parts in the junk box to pretty much build another AR. That's why I carry a spare tire on my truck, and a can of Fix-a-Flat when I travel.
You keep mentioning the prepper part... if you are a prepper, and intend to include firearms in your preparations, you had better learn about what you have, how to maintain it, and how to fix it if something doesn't work, whether it's an AR, a Glock, an AK, or a flintlock rifle. Just like solar panels and a battery storage system. Just like holding tanks and irrigation. Just like food preparation and storage. Just like vehicle maintenance, be it a motorcycle, a tractor, a pickup, or a bicycle. If you are a prepper, and you can't field strip an AR for cleaning and maintenance, you might want to rethink your idea of being a prepper.
Taking the AR out of the equation... if I was going to rely on a firearm as my sole weapon for defense, hunting, or whatever, I'd darned sure learn how to maintain it... whether it was a bolt action rifle, a pump shotgun, a revolver, or semiauto pistol.
We got it... you don't like AR's. Which is fine. Really. I don't like Glocks, and it's OK, too. I think they are a marvel of engineering and excellent pistols... for someone else. This is (still) America... if you don't like AR's, there are about a gazillion other types of firearm platforms out there to choose from.