While we didn’t “ruin” our product at Korrio, it’s easy to fall into this trap. When you have people with a lot of experience in a space as we do there are times when you rely on their experience instead of going straight to “real world” users. Without that feedback features that seem insignificant internally are absolutely requirements externally, and the “big ticket” features you expect customers to get excited about end up as the ones with the least interest to them.
So get up, get out and meet some real customers. Don’t rely on the internal voices (within your company or in your head) to tell you everything.