I see what you mean, but on certain projects the language used can be a differentiator (not in marketing, but at least in concept).
See for example Redox. The whole point is to build an operating system in Rust because of the language safety, which allegedly trickles down to more safety in the user space.
Or PyPy, whose whole point is that it's written in Python.
Yes. Because of the language safety. This is a feature, and everyone that has written “malloc” and read about rust understands where it comes from. “Lisp --> better browser” is not so immediate.
Re. Pypy, the advantage of “the language you like written in the language you like” is also pretty immediate.
My point being, dont leave the target of the message do the work of researching and understanding. Just selling the language is normally not enough.
See for example Redox. The whole point is to build an operating system in Rust because of the language safety, which allegedly trickles down to more safety in the user space.
Or PyPy, whose whole point is that it's written in Python.