Reason being only one platform (the Peg-II) can currently run OS4 and MOS, and that's not available and somewhat limited (no RadeonHD, PCI/AGP only etc.). Having another machine which can be bought and which runs both can only be a good thing, in my opinion.
Supporting the X5000 would be a better move, imho.
Future Sam460 availability is questionable.
Acube really needs to reconsider is processor choices.
Applied Micro CPUs are just too weak.
A 1.4 GHz e5500 cored T1020 would not significantly raise board costs, it would be faster, and dual core.