That is a differentiator if your competitors are written in Python or Ruby or Bash or whatever. But yeah obviously for marketing to normal people you'd have to say "it's fast and reliable and easy to distribute" because they wouldn't know that these are properties of Go.
> You can write slow unmaintainable brittle garbage in any language though.
Sure. You can drive really slowly in a sports car. But if you're looking for travel options for a long distance journey are you going to pick the sports car or the bicycle.
Also I have actually yet to find slow unmaintainable brittle garbage written in Go or Rust. I'm sure it's possible but it's vastly less likely.
I’m still responding to the first sentence. It’s not a differentiator, even to smart engineers who understand the programming language in question (e.g., Go or Rust). Whenever an engineer leads with the programming language, I know that it’s just their favorite. You can write great Python, Ruby, Go or Rust, or you can write crappy Python, Ruby, Go, or Rust. Yes, some languages make more sense for certain environments (probably don’t want to do kernel programming in Ruby, for instance), but the programming language is never the differentiator itself. It’s what you make happen with it.
> You can write great Python, Ruby, Go or Rust, or you can write crappy Python, Ruby, Go, or Rust. ... the programming language is never the differentiator itself
This is called "the fallacy of grey". Very common.
https://www.lesswrong.com/posts/dLJv2CoRCgeC2mPgj/the-fallac...
You can write slow unmaintainable brittle garbage in any language though. So even if your competition is literally written in Bash or whatever you should still say what your implementation actually does better - and if it's performance, back it up with something that lets me know you have actually measured the impact on real world use cases and are not just assuming "we wrote it in $language therefore it must be fast".