I suspect that from CPC's point of view they were the people expected to fill the gap in support - or lack thereof.
... finding the images to flash onto the board is the first hurdle.
... then you realise that there is a mess of sources linked to apt, with some packages having dependencies that can't be satisfied.
... it really is not a pretty sight.
That said, I think it's a decent board, and I hope it is easier to source in the future than currently, but it's not a 'plug and go' type of board, you will run into issues, and familiarity with linux in general - not just the basics, is a requirement.
... it does not have to be, but unless Asus put their weight in to create a momemtum then I think it will be hard for them to create demand, and, as a result, a network for distribution.