I recently put in a lot of hours for a software system to be able to handle webp just as well as every other image format it already accepted. I put in a lot of work as well. Hadn't heard about it for a while, but saw the feature release statement for the new version I knew my changes were in. It wasn't on there. So I reached out to my contact and asked if there was an issue or did it get bumped to a later version or what? So she told me the marketing team that do the release statements decided not to include it. They stated for one, people already expect common formats to be handled. Saying you now handle a format looks bad, since people know you didn't handle it before and were behind the curve. The second (probably more important) reason was nobody knew what webp even was and it's only something technical people care about (they probably said nerds, but my contact translated). So no regular customer would be interested and it could only lead to confusion and questions.
I hope somebody is happy with the work I put in tho. Somebody is going to drag a webp into the system and have it be accepted. Someday.... I hope...