[bobz]

Well, I wouldn't phrase it that way, but it's not a fallacious argument.

If I were to rephrase, I would say, application developers aren't full stack developers.

Modern languages and frameworks hide a lot of complexity, allowing application developers to focus on business problems, which is a good thing.

But if you want to continue to grow as a programmer, and understand the tools you use, or use them to maximum efficiency, understanding things like Big-O analysis are crucial.

I don't often do complex "math" or analysis using Big-O... but understanding the core tenants are crucial, especially as you move from building apps to building frameworks themselves.