The first party camera is designed to be operated by every human being on the planet. Redesigning it to accommodate highend workflows makes as much sense as redesigning a $50,000 cinema camera to accommodate parents who want to record their kid's soccer game.

Apple wants to demonstrate that an ecosystem exists of companies making Pro-Level software & solutions, just for Apple hardware.

Historically, this has meant for the Mac.

But it also includes iPhone.

Perhaps even more interesting, the behind the scenes video also suggests that most of the editing was done in DaVinci Resolve, not Final Cut Pro.

I was honestly curious about that myself, I have generally just used the stock one but I am now curious if that one works better or has some better features.