I never had any issues installing software on macOS. In the worst-case scenario, I need to press an extra button in the security panel agreeing with installing software that is not from an identified developer. I agree with the sentiment from OP, but this seems to be an inaccurate extrapolation from the Nostr-being-censored-on-iphones thing. Not saying this might be the direction macOS is going, but it's not the present. I don't think macOS being as restricted as iOS is viable as many professionals rely on macOS where most of the software does not come from the Applestore.