hum.... well. If you imagine that they are 100% idempotent on every platform and 100% fully supported. It would work.
But as I stated in my example python/Perl/C# and probably others are in the language support dropping either some platform or supporting only x% of the feature on some platform...
I dare you to access you services using C#/mono on openBSD.
I'm running FreeBSD as it happens and C# works absolutely fine - I have even just downloaded random .net exes and run them and had them work.
If you had a race where you picked a random C program and a random python/perl/C# program off github/sourceforge/whatever and tried to run them on OpenBSD, I'm pretty sure 9/10 times the python/perl/C# would win.
But as I stated in my example python/Perl/C# and probably others are in the language support dropping either some platform or supporting only x% of the feature on some platform...
I dare you to access you services using C#/mono on openBSD.