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Don't blame the users. Unless Google have hidden a copy of Crysis inside the Gmail app there's no hidden functionality which should come even close to requiring hundreds of megabytes.

Gmail barely has any features, which haven't changed since it's inception. Most of the code is in the cloud.

A lot of features are configurable by the domain administrators. As a user of the @gmail.com email, you won't see any.

This might be true but most of time its just bloat no one uses.