“Now apps from both the App Store and the internet can be installed worry-free.”
apple.com
apple.com
> Now apps from both the App Store and the internet can be installed worry-free. App Review makes sure each app in the App Store is reviewed before it’s accepted. Gatekeeper on your Mac ensures that all apps from the internet have already been checked by Apple for known malicious code — before you run them the first time. If there’s ever a problem with an app, Apple can quickly stop new installations and even block the app from launching again.
>but why won't Apple allow me to sideload if this is secure enough.
My observation is that no one would buy a computer as locked down as iOS, so Apple has been slow walking MacOS into the iOS model, not the other way around. iOS won't become more useful, MacOS will only become less useful over time.
You’re kinda forced to do that if you have a large enough user base as an app developer. Otherwise people will get the scary Gatekeeper alert of “unidentified developer” and “can do harm”
Work computers might even refuse to launch the app altogether if they have a stricter policy.