Quite honestly, the smartest move MorphOS ever did was base their dev on the hardline HW guidelines Apple did.
I'd like to think they did that deliberately, but I don't know much about the project. Avoids the gongshow AROS has with SATA/gfx cards not working, etc.
If it's on the list, MorphOS will run on it. No dicking around waiting for 3d drivers, sata drivers, etc - everything is universal.
As for why no new hardware? Morph runs quite fine on HW that most people consider "doorstops", like the G4 minis. The Apple crowd will give those damned things away all day long cause they just aren't cool enough anymore

Morph isn't a HW company, and tbh, going against the Intel/x86 camps hardware wise these days is sheer suicide on the consumer end.