For some reason, app sizes seem to have exploded, but especially on iPhones. Maybe it's the fact cheap Androids are still being used but I was surprised to find out how many 50MB Android apps were in 200MB iPhone apps.
When it took ages to download the same app to my work iPhone as I was downloading to my normal Android I thought there was something wrong with the iPhone at first, but it was literally spending five times the data to download what seemed to be an identical app.
There's something to be said for downloading a 50MiB app to save yourself from downloading 1MiB every time you pull out the website, but with modern app sizes, things are getting ridiculous.