Garbage in, garbage out.

A lot of technical jobs are like this. Knowing what makes good input and being able to judge good output. You could say coding is just typing in lines of code. Or what other types of engineering are just trying different architectures, geometries, or values until something works.

Its not necessarily "difficult", but a lot of jobs are just applying knowledge of context and then polishing an output for use. In a future prompt engineer role you might be editing copy for a chosen audience, or finding a useful way to organize the input so that a good output takes an hour to land on, instead of a week.

I guess the long answer is "we don't know", but the short answer is that yes, the smart money seems to be having some knowledge of how to use AI might be useful in your career, ten years from now.