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What sort of a use case requires you to run "lots of VMs"? What nature of development do you do?

Some of the software I write must work on various different Linux releases (with different kernels), FreeBSD, OpenBSD, Haiku and Windows. This is realistically only possible because I have all these running in different VMs.

I'd like to add macOS to the mix but it's something of a pain to virtualize. I'm aware of hackintoshes but there seem to be a bunch of gotchas and it seems you can never upgrade them.

I also have some VMs where I need decent security guarantees and confinement, such as running different web services.

Makes sense, thank you!

This is one place containers do genuinely have the edge (if you can stomach running them outside a VM, of course...)

I don't feel right to ask this question using "Ask HN" - how many VMs you usually run?