Although, I’ve found I very rarely need the guest for gaming anymore, more so for opening the odd Photoshop file and similar tasks.
In 2010, used to dual boot. In 2014 or so, I switched to VFIO GPU/SSD passthrough and never booted to Windows again. In maybe 2019 or so, I pretty much stopped using passthrough even, though this is partly because I stopped playing a few games that proton didn't run (mostly because of e.g. Easy Anti Cheat, etc).
I don't even have my windows ssd installed in my tower any more, that's how little I expect to need it these days.
People still use local storage.
(I'd also like native ext4 support in Windows.)
And given the availability of cloud storage, I can just upload whatever little I need to share.