>> Developers should work by wasting lots of time making the wrong thing?

> Yes. In fact, that's not emphatic enough: HELL YES!

You do realize there are prior research and well tested solutions for a lot of things. Instead of wasting time making the wrong thing, it is faster to do some research if the problem has already been solved. Experimentation is fine only after checking that the problem space is truly novel or there's not enough information around.

It is faster to iterate in your mental space and in front of a whiteboard than in code.