Microsoft and Nutanix have had a hyperconverged architecture for over a decade. Oxide is mostly an alternative to Nutanix or other soup-to-nuts private clouds.
Oxide is a really nice platform. I keep trying to manipulate things at work to justify the buy in (I really want to play wiht their stuff), but they aren't going for it.
The first attempts at hyperconverged were very hardware focused and kinda meh. Nutanix is the best example - they pioneered hyperconverged hardware but the firmware/software was extremely average. Oxide are the first to say "it should just feel like cloud, except you own it" and building for that.
Afaik nutanix doesn't sell a custom rack, running custom firmware, preloaded with their software though.