That is indeed pretty good! If the experts would only call things utterly stupid that are in fact utterly stupid, you’ve got it made. All you have to do is run your policies by the experts and have them explain why those 30 are utterly stupid, and then advocate for the remaining 20. If they’d call 40 of them stupid and only 30 are, now we have the problem that we are discarding 10 good ideas, but that still leaves 10 good ideas, 8 of which worked out. Sweet!
It’s certainly possible to think you’re better than you are, this way, but this is far from inevitable. But it’s pretty immodest to claim “I generate ideas that, conditional on being implemented, have an 80% chance of working.” Provided that far less than 80% of similar implemented policies work, at least.
Advocating strongly for a policy that would work in the worlds in which it could possibly get implemented is a good idea even if most of your policies would be diasterous. I can’t think of a source of good ideas that doesn’t mostly generate bad ideas until it encounters criticism, but the process working at all seems like a hugely immodest claim.
I don’t understand what you mean by “conditional on being implemented.” Do you mean that for each policy, it is implemented regardless of being impossible, then out of these words we find the number that have gotten better relative to their controls? Or do you mean that we find the number of possible worlds in which the policy is implemented, and compare it to a similar possible world in which it is not, and determine if a positive correlation between “has Policy X implemented” and “is a world with Y utilons”? The former doesn’t seem right, but in context the latter doesn’t seem to fit.