64 bit & mono?/il2cpp

I have had a number of issues porting a project to ios (which was created in windows) to do with compiling and supporting 64bit on ios which are mainly to do with simple player settings.
First is this bug which looks to be fixed now:
(866194) - iOS: Fixed build errors in XCode when stripping is enabled using Mono scripting backend.

But I am wondering why the Mono scripting backend option is still there when you...

64 bit & mono?/il2cpp