Comment by eddythompson80

In my experience, someone will eventually care, especially in enterprises or large orgs that don’t know what they are doing, then want to run dockerd or mount a share from some legacy system. Then the problem becomes do you lose that class of users or do you build 2 backends (A gVisor and a kvm/firecracker/etc) or just build a kvm one.

Google tried to do their Cloud Run gvisor only, then 2 years later switched to a hypervisor (though I don’t know if they use kvm or something else). That has been my experience also in trying to run an “emulated” Linux anything. Eventually some tough compat issue arrises and you wish you had just ran the real thing and figured all the issues with that instead. Tbf, gVisor offers much better density and much easier resource management etc. just the compat issues are tough unless you’re willing to (or can) say no to some scenarios.