It seems like it would be a lot of work to keep up with the annual deluge of new APIs and OS features in MacOS that application developers will incorporate pret

It seems like it would be a lot of work to keep up with the annual deluge of new APIs and OS features in MacOS that application developers will incorporate pretty quickly. To really keep the promise of source-code compatibility, it seems like you'd need to quickly absorb all of the new APIs, plus, figure out how to implement them at the lower levels, on a different OS (MacOS is mach-based.) Of course, the project has doubtless thought much more about this than I have, and maybe have an awesome plan, too.