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> I just want a VM (or similar)

Especially something like WSL2, which Docker Desktop for Windows uses in the latest releases. I know that is a VM (or similar) but the way it uses memory on demand, rather than reserving a huge chunk of your memory up front, makes a huge difference from a typical VM experience.

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VM tools have allowed this sort of RAM management for years.

That's unhelpfully dismissive. It's not how VirtualBox (with guest additions) or HyperV seem to work in the default configuration, so it's not trivial to do. Could you explain how to get this to work on Windows? What virtualisation software would you suggest? (And can it nest in Hyper-V?)

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