Earlier quoted context omitted.
If you like Apple's policies, just don't sideload and install everything from their official AppStore. Nothing will change for you then. You can do it on MacBooks as well.
I'm rather indifferent on the matter, but this doesn't quite hold true. It's possible (likely?) that a someone big - one who ordinary folk would go through the jumps for - would only publish their app via side loading (or alt app store) and use this to bypass some of the policy restrictions wrt privacy on the App Store. This then becomes a slippery slope and would act as a platform to allow other apps through. The to…
The App Store was only ever a first line of defense against icky behavior.