Usually some excuse about being more accessible from someone that just doesn't want to leave their own comfort zone - non professionals playing at being professional after coming across our github. See also: complaints about not having an installer download (strictly clone and build)

C# can have native performance, if you sit down and really optimize shit until you go mad, you can have absolutely minimal runtime friction. The .Net runtime despite it's stupid fucking name from a bygone era is actually really smart with code gen.

This of course depends on the code, project and your own skill level