That said, I've been playing around more and more with WSL2 on a secondary machine as a current primary Fedora user (for about 10 years now) and I really haven't found a good reason why I would need systemd in the WSL2 VM vs the custom init.
In practice that hasn't been a roadblock for me, because VMWare Workstation 15.5 finally supports running on top of Hyper-V, so I can have both working at once. Moving everything to a single hypervisor API has some nice benefits...
/s, obviously.
Most WSL2 users use it as shell to run occasional ELF/x64 binary that runs in console; for services, they would use Docker Desktop for Windows. Anything beyond that and you will quickly find out, that it is not really a standard linux distribution.