You cannot recreate a breakthrough by including the same design errors in a modern re-creation, let it be Morphos, OS4 or ARos. The classics are - classic old computes in a classic old environment.
Rather, if I want to have some fun with modern machines, I'd rather go for a modern Os and play with that. Works, too.
So-called modern OSes have their roots in even older designs than AmigaOS, with their own design flaws. For instance, Linux, as you know, has its roots in 1970s Unix, and I was reading today how compatibility with the Unix behaviour of recording file access times is viewed as a major performance bottleneck when strictly adhered too. AmigaOS thankfully never used the concept of last access time. And AmigaOS has always had asynchronous I/O support, unlike Unix and its descendants.
IMHO AmigaOS has a lot of good design features as well as its drawbacks, which is why I don't want to leave them in the past. It has its own heritage, like the mainstream OSes, but hasn't had the same investment.