[wenc]

So for me, it's all about instrumental rationality -- do the thing that works, not the thing that ought or ought not to work. It's important to put things into practice.

Social science is full of hypotheses that are difficult to measure scientifically. Some are straight out wrong.

Others are instrumentally rational -- they are correct enough of the time if done in the right context (which may not always arise, but when they do, you're golden). The latter are the stuff we need to try out. Growth vs fixed mindset is a heuristic -- this means it's not always right, but it's useful enough that when applied you can often see meaningful results.