You caught me red handed at not being concrete! Shame on me!

By B I meant applying the idea from "Say not 'Complexity'".

You adjusting B in direction X is what I pointed out when I accused you of changing my original comment.

By Y I mean something like our later consensus, which boils down to (Y1) "we can use the heuristic of 'simple doesn't work' in this case, because in this case we have pretty high confidence that that's how it really is; which still doesn't make it a method we can use for finding solutions and is dangerous to use without sufficient basis"

Or it could even become (Y2) "we can get something out of considering those simple and wrong solutions" which is close to Gram_Stone's original point.