It's not entirely the same. Imagine instead that it's your technical cofounder, who isn't quite as well immersed in the application as you, and may not get all

It's not entirely the same. Imagine instead that it's your technical cofounder, who isn't quite as well immersed in the application as you, and may not get all your code idioms, but still knows their way around a compiler, and can hack in a quick bug fix in a pinch, even if the resulting code isn't as elegant as you would have done it. They know to run the test suite, even if they don't add a new test case for the bug fix. How mad should you be then? The reality is that everyone here speaks English, and if the guy is editing your copy, it means he has opinions about English, which is enough to make him "technical" in the sense of the previous example. He's not as good as you are, but his copy will be serviceable. The situation you describe would be akin to having your cofounder be unfamiliar with English grammar.