I don’t get this mindset. Even when writing a trivial app, basic CS knowledge is relevant all the time when it comes to modeling your data, manipulating it; oftentimes knowing a bit of mathematical formalisms lets you express things in much more direct ways. Similarly, computer architecture basics let you quickly estimate the plausibility of various features, etc.

If you’re a programmer who doesn’t know any CS at all, you probably have a lot of room to improve.

Kind of like a chef who only uses frozen foods and then doesn’t understand why things taste weird.