I guess time will tell VXBlock just looks like amalgamation of SKUs Dell has. Oxide was built as "clean slate" from firmware to every minute detail to offer a compelling product for companies that want to have a hyperscaler style systems for their on-prem workloads.
Is it now bad to have a few offerings that you can tailor to your needs?
With compute one size doesn't fit all, maybe you need more disk space or maybe you need GPUs... I'm sure Oxide will come out with different spec modules over time.
The idea is similar: It's a rack which runs virtualized workloads and you don't have to think much about individual machines.