The difference compared to a quarter of a century ago is that hardware virtualization is an ubiquitous thing now and that machines go so much faster that you don't even realize you're running in a VM anymore: it's pretty much transparent. I run Docker on my Linux servers inside a VM. There's no way I let Docker touch the bare metal, not with a ten foot pole.

If people want or need to run Docker on FreeBSD, they can run a Linux VM under bhyve.