If you don't use it, delete it. You can always go back to the app store and reinstall it if you want. Yes, it has extra content unique to it, but if you don't use it, you don't use it. I use it on my phone and iPad often to do string-outs and such, then take that into FCPX for the heavy work. My kids use it. Wife does a gardening blog with it on her iiPhone.
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