I originally viewed the "walled garden" as a limitation that would eventually be solved. I awaited improved iModels but Apple had other plans. The "walled garden" is extending further and further into the desktop computers with each MacOS release. Portable files and freely available applications are deprecated in the current OS. The next OS appears to push this even harder; further restricting what applications can do if they don't run in Apple's private "sandbox". Apple is taking such drastic measures to lock-in customers that, for the first time 20+ years, I can't see my self buying anything more from them.