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I'm just taking a wild guess here, but I'd guess it's not a problem - WSL2 works afaik by having a native ext4 partition, and the Windows kernel accesses it. Intra-OS file perf is great, but using Windows to access Linux files is slow.

MacOS just understands ext4 directly, and should be able to read/write it with no performance penalty.

I would imagine it is low lift - using https://developer.apple.com/documentation/virtualization/sha... which is already built into the OS

If they wanted to improve the situation they would’ve needed to ship an apfs driver and a Linux kernel. Sadly they didn’t.

AFPS isn't the solution since you can't have two kernels accessing the same FS. The solution is probably something like virtio-fs with DAX.

I wonder how it compares to orbstack