If you don't want to sideload, then don't. If companies don't want to be on the platform app store anymore, it's not the end of the world. I ran a windows phone for several years; if there's no app for something, there's usually a website, and Safari is loads more usable than mobile IE or mobile Edge; so you're fine for the most part.

Yeah, you might lose out on playing FPS games on your phone, but is that really a loss?