I worked on a project where this came up. We had some product features that weren't really used. We continued to talk about all the benefits of those features and when the business had renewed interest in that area we jumped to turning those features on.

Only to find out they barely worked. FWIW the unit tests were pretty solid but the integrations weren't and the graceful degradation story was a little too good.

So we went from no complaints to having an entire department breathing down our next because all of the sudden people started giving a shit about our product (web performance improvements).