More sensible, yes... but less ideologically pure.
I'd love to see a full fleet of Mac servers (XServe was a handsome piece of kit), but I believe one shall choose their battles.
The more I think about it the more I doubt it, even if you make your own hardware it is hard to compete with a commodity server, but it is an interesting thought.
Update: or perhaps they do, a sibling comment had a picture of such.
Not sure about the backplane architecture. I’m pretty sure they are custom datacenter rack units.