The small and low power specs that makes a mac mini interesting is already available in x86 land, https://www.bee-link.com/beelink-gaming-pc-ser7840-19943849-clone-1 this is just one of many examples. It uses 6-10w idle and has upgradeable and user replaceable ram and drives. It's faster than the m2 mac mini, prob about the same as m2 pro. I use these for media servers, desktops, backup servers, application servers etc. The AMD ones are good enough for light gaming and the Intel ones have QuickSync which is great for de/encoding fast and low power.
The problem with asking devs to port unraid to the mac mini is less about porting the kernel to ARM and more the issue that the mac mini is not a standard pc that just happens to have an ARM cpu, its a mac and nearly everything in the thing is custom hardware proprietary to apple and unraid being an OS needs to support all of that and apple would not support them if not even be antagonistic to it. There is barely linux ports running on mac mini hardware and those distros are dedicated to specifically that purpose.
I agree with ich777 that Risc-V is a lot more interesting than ARM in the next few years as ARM tends to only be found in custom proprietary designs at the consumer level, while Risc-V should be a much more open and standardized platform similar to x86 - it's not because anyone is specifically beholden to the x86 ISA or anti Mac imho.