At this point, for months I have been contacting app developers and Apple requesting the ability to clear an app's cache. I have only 1 app that I use that supports this feature - WallpapersHD.
All apps should support cache clearing. Especially apps that bloat like: Netflix, YouTube, Amazon Instant Video, TUAW, iMore, Twitter, TWC Max, Weather [Yahoo], Trailers [Apple], Bible [YouVersion]... Practically any and every app I have ever used that communicates with a remote server out there in the world somewhere.
iOS needs a cache clearing option to assist in managing space because deleting and re-installing apps is a terrible way to get that space back.