Honestly, building a new OS and running the old one sandboxed for backwards compatibility, apple style, would have been the best option. They shouldn't have done os4, morphos, aros, none of it. not even OS 3.5 and 3.9. The amiga platform has been handled so badly, shuffled around by companies with no plan and no real way of doing it anyway, it's shocking. Best of luck to anubis-os, that's what should have happened in the 90s.