AROS is a good thing true. It give hobbyists something more to play with, a chance to relive the Amiga experience on modern equipment, but it also locks it's developments into the late '80s/early '90s.
In the end it's all about enjoying your hobby and not worrying about justifying it, it's becoming more ad more likely that I will need to part with my old Amigas before they die, if I do it'll still be fun to have AROS around to play with, providing the Amiga experience on discarded PC hardware, or perhaps as a VMWare machine.