That's all fine and dandy until the day comes at MSFT stops maintaining the WSL subsystem and/or lets subtle incompatibilities creep in.
Bring it up with Microsoft? What do Windows app developers do when Wine doesn't run their application correctly?
How does it compare to offering a build linked against the Cygwin library?
Zero extra work and no need for a separate box or VM, and a Windows licence, to test the build.