This is great, but why not just have Garage Band work the same / be the same on both platforms?

I'm a PC user; few years ago I realized how great iPad GarageBand was for playing around. Like an idiot, I literally purchased a used MacBook so I can edit my iPad travelling doodles at home with big screen as well, only to realize that they are different software with different capabilities and you cannot seamlessly copy projects from one to another.

I openly admit I'm an idiot for jumping in like that, but for all the discussion on how user friendly and seamless Apple ecosystem is, I still don't think it was a ridiculous assumption to make :-/