We have no concrete plans to do this. I suspect that there will be a good reason to one day, but we/the world are not there.
Having a bunch of people trying to run Roon on inadequate ARM platforms (this would happen immediately if we released an ARM core for hobbyist oriented boards) would push the product in a direction of economization/reduced ambition/reduced functionality that we do not like.
From a business standpoint supporting tinkerer-oriented ARM devices for the Core doesn’t appear to help us much. We like to turn computing power into user experience. The product is still growing. It’s not time to put the dampers on that by introducing support for a constrained platform that we think will be popular.
When this thread came up, I hoped someone had a really interesting ARM board in mind. Something with 6-8 cores at 2GHz+, a Cortex A72 or A73, 4GB+ of RAM, PCIe SSD support. Good SATA/USB3/GigE support without bus bottlenecks.
The A17 Tinkerboard with 2GB doesn’t really tick those boxes.
I’ve seen a couple of platforms from Marvell that were interesting enough to make me want to try them out (not stuff from the hobbyist market…more like ARM bladeserver/NAS SoCs). Nothing at the level of a fast NUC, but some that seemed close enough. These are, of course, not much cheaper than a NUC and are less convenient…so no point right now.