I love the concept of it and have been thinking about getting one the only problem I see right now is no ability as far as I can see to get an external dock to run an additional external gpu in the future.
I've also seen quite a few mini PCs with Oculink port and Strix Halo CPUs.
https://www.youtube.com/watch?v=TvNYpyA1ZGk
There are ways to manage BAR better in linux or with UEFI preboot environments for windows as hobbyists have been doing for ages due to bad BIOS support https://github.com/xCuri0/ReBarUEFI