The ChatGPT mockup looks like it was done by a designer who has never seen a Mac. UI sections that Bike uses are already present in Finder as well. See the attached screenshot: the sidebar floats, and the inspector is attached to the content layer. All of this is standard interface elements present in AppKit and SwiftUI already. No need to reinvent the wheel here.
That would be way too easy! I did try, didn’t feel right for me and for Bike. Design I seem to be ending up with I like a lot. And don’t worry, very far away from that ChatGPT brainstorm image too.