Nay-sayers exist too, but I think they are out of scope for what PG is talking about. He's talking about the people actually working on solving a problem, not someone on the sidelines.
Right. It confused me but re-reading PG's post he's certainly making that distinction. Yeah- I have seen the bash your head against a wall and not take any input kind of stubborn.
That confusion does make this exact obstinate/persistent terminology tricky for conversations outside this particular HN thread, though. Which is a shame, because the underlying distinction as you've laid it out is very important.
