Because we solve the same problems with different tools, languages, and frameworks.

The core of what we do never changes - get input from user, show error, get input again, save the input, show the input.

Now it just got more complicated, even though 20 years later most of this could be a dull Rails or a Django app.

And AI will probably do the decent CRUD part, but you will still need an expert for the hard parts of software.