I don't want sideloading because it will eventually be required by most developers. You can't say "just don't sideload" because soon enough apps even from top developers will be unavailable in the App Store. Once sideloading becomes an option on iOS, it will become a necessity. You'll end up having the Microsoft Store, the Adobe Store, Facebook Store, Epic (remember them?) Store, Zynga, King, Google, etc., all with their own licensing agreements, billing, return policies, storage use, bandwidth use, etc.
When something goes wrong, developers of sideloaded apps will point fingers at each other, Apple, and the user, and they will never accept responsibility. The user will be left with no recourse.
I trust Apple far more than random developer #329487 when it comes to security and privacy.