MacOS is not your personal emergency device is it?And what about the free and open workd of macOS? Does macOS have relentless malware and ransomware attacks? It's not like you need to be a genius to see that it doesn't.... or maybe you do. ?♂️
And has been stated numerous times over and over and over again whenever the subject of sideloading and an alternative app store to Apple's comes up, if you don't feel comfortable using an app store not operated by Apple, you're free not to. You will not be forced to do so.
Do you understand what that means?
The Mac has nowhere near as many users installed compared to iOS/iPhone.
And we have to deal with the existing architecture of macOS because its been there for 20 odd yrs now. So you live with the technical debt. iOS is a new and better way to secure personal computing devices to the extent that they can be used as an emergency device. Its designed in such a way to facilitate low maintenance operation and security by default. I want that choice to still exist. If I didnt care I'd just buy an Android machine and live with the "Swiss cheese" OS that no one bothers upgrading properly.