On the subject of Apple making macOS a closed ecosystem, ala iOS, I have commented that they can't. They have to keep macOS a general purpose OS in order to write iOS apps. Someone else responded that they could move all iOS development to tools running in the clown, and this prospect makes me very nervous. I, too, like everything running locally, and have no desire for ANY of these remote tool ideas. It "solves" problems -- which I perceive -- relatively few of us have, but which companies would LOVE to corner the market on, and lock people into yet another walled garden.