Granted, access to those files is slow as dirt because of the Plan9 filesystem, and there are some weird bugs where a process sometimes loses access to $cwd if it's not a native wsl filesystem (also a Plan9 bug reported to MS over a year ago). But it's tolerable when interoperability is necessary.
It also facilitates using the same filesystem under multiple WSL instances.
It’s possible in file explorer via \\wsl$, but that is not always supported by applications so it’s not 100%.