I'm really curious: what kind of workload would companies want to run on a custom Unix that isn't Linux/Mac/BSD? I'm rooting for more mature OS diversity, I just have no idea who the end users would be and what their needs would look like.
This is not a user-facing detail of the product. Customers run VMs on the rack, they do not build their applications for illumos. They're gonna run whatever operating system in those VMs that they need to accomplish their goals.
I'd imagine as broadcom slowly destroys vmware's market share vendors will look to alternatives, but I doubt b-hyve is even a blip on their radar at this point.