That's… completely false. At least for me. You should really stop and think before accusing people to have noob workloads.
Even cronjobs work… The performance is sometimes better than on native linux, as a few of the syscalls are better implemented on windows. The file performance is abysmal, but that only hurts if you're using npm (and there you're in a world of pain already anyways).
The only thing lacking, is that some debuggers don't work, which is a pity, but then I just start a docker container and mount it on my filesystem.
I am using services on it too actually, everything works as expected. I can actually create windows bat files to redirect to linux binaries, which lets me do for example OCaml development, with the linux toolchain, on a system that actually works reliably. (my experience is, that as of windows 10, desktop linux environments crash way more often than windows ones)