I don't think that makes it makes his question any less valid. Yosemite has been out 18 months, true, but hypervisor.framework has had a lot of work done - even Docker acknowledges that they've been filing several Radar bugs on it even to this day.

Yes, any new virtualization projects should strongly consider using it, but that doesn't mean any issues with projects with have a massive investment in tooling and ecosystem should be considered deprecated and dead just because of this.