But that is not true. I can say idea X is bad and it can succeed due to any number of reasons. That doesn’t disprove that it is a bad idea (relative to some better idea, let’s say).
If you say "X is bad, it's going to fail", and it succeeds, it certainly doesn't make you look good, and I think that's what the previous comment was getting at.
But it's rarely a "it's going to fail". Normally it's "it'll make more effort for people down the line" or "we'll get more customers if we do X instead".
