The parent comment very clearly and explicitly described how one can work around that lockdown on iOS and iPadOS with MDM and Xcode or something like TestFlight functionality. They weren't talking about macOS, because you can run whatever you want on it after disabling a couple of toggles in the security settings once (just like on Windows10).

For most people, your argument is akin to saying "you too can go into space if you just start your own commercial space company".

I would argue that this is by design. If you cannot figure how to do it, despite fairly simple and quick instructions, you probably shouldn't be sideloading apps on your phone.

It costs you nothing to sideload an app (other than time), but it costs money to make a company. Not a fitting analogy.

Sideloading an App is non trivial and not something that one would expect their userbase to undertake and it requires the user to have access to a Mac to perform it.