But there is no technical reason for it being locked down. I don't want to subject myself to more of this, which would be the result if I get dependent on it. Why would I? There are only disadvantages if I don't want to sell software for the ecosystem.

I do some low level system developing and I doubt I would ever switch to MacOS for this. Higher level software? Maybe, but as I said, why give Apple any handle here and these sandboxes don't provide security for me. I will also not get a dev cert from anyone, that is just something that will never happen.