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 need il2cpp for 64bit build?

I would also have preferred it had automatically selected il2cpp the first time I opened the project on mac but I am guessing this is because the project started a long time ago and some old default was left in there…

Most of my builds during development are with the Mono scripting backend as it’s faster to build so I don’t want that option removed any time soon.

Ah yes I can see that could be useful - though performance may suffer and you get that popup warning message when 32bit to say as much.