I'm not sure that is a huge problem for the Mac Mini, it was released in late 2018 so we are only at about 18 months now. We are long past the stage where every new operating system version demanded new hardware.
The Hades Canyon Nucs come close, but are larger, have a power brick and are not my taste in design. But the 2x nic, graphics, storage options and price are compelling.
Bring on ARM.
They're better than anything you can find in the bracket that you place them in.
Sure, everything can always be better but I don't see much market pressure forcing it.