The number of features sales has told us some big sale hinged on, that subsequently no one has used, is very high. We actually restructured our entire product to win the sale of a very large customer who’s users didn’t fit perfectly into our metaphor. It was unwieldy and we basically rolled the whole thing back several years later.
I could give almost limitless examples where we've been forced to drop everything and jump on implementing a hacky version of a new feature because sales convinced the CTO we were going to lose a major client if we didn't implement it asap. They were usually never used, or used by an incredibly small percentage of users. The platform ended up a complete mess because of the number of hacky features implemented and was…
Sometimes it is not the number of users that need the feature but just 1 or 2 very important users... The ones that have the final say over Yes we use this, or no we do not