32bit Arm is going away.
They are looking for the resources for a 64bit port.
That seems like an entirely reasonable ask. I don't know if enough people are interested but it seems entirely reasonable to ask.
At some point was updated to 32 bit, you can run it on a Raspberry Pi.
For code the limitation was baked into the architecture itself. The bottom two bits of the program counter were used to define the current execution mode (and always output as 0 to fetch word aligned instructions) while the top six bits were the status flag. That meant that saving the PC to the stack saved the whole execution context in a single memory write and it only took one read to restore it.
Fixing this required moving the flags to a separate register, which was a very visible change.
Unlikely for embedded.
Granted, some do not. Fujitsu's supercomputer comes to mind.
That's no doubt why this is a big issue for ROOL, as the pi is one of the main things they run on. Very few people would buy something just to run RiscOS so they need a relatively common platform.