iOS Apps Need To Go On A Diet

I happened to check my free space on my 16 GB iPhone earlier and noticed I was down to 53 MB of unused space. I noticed that Google Drive and Dropbox had swelled to 500 MB each. Droplr and Evernote had both jumped up to 200-300 MB in usage. Reinstalling these apps immediately freed up a ton of space. I know this problem will come back as it appears to be cached files. Shouldn't this be something iOS handles for us? Why should apps be able to continue to grow and grow? Some developers allow you to clean the cache inside the app or limit the amount of space it can use, but this is really something that iOS 8 should automate. Regular people should not be expected to delete and reinstall apps to free up space.