I'm surprised to read this, because I've always thought tight integration and clever synergies between product lines were precisely one of the things Apple excelled at.
And I was wondering how exactly they managed to make that happen in such a famously secretive organization, where very few people have the 10.000 feet view required to come up with these ideas.
How do you make Mac Catalyst or Sidecar happen with 4 people silos who hardly ever meet and adjust ? How do you redesign the iOS photos app to the capabilities of the new hardware, in a way that will make sense once software+hardware become a product ? How do pictures of unreleased Airpods end up in recent iOS beta releases ? I mean, at some point you've got to make these things work together, and one decision on one side that's oblivious to the other side's constraints might make things impossible to them, and they'll want to push back. This is how "normal" companies function.
One more example, not something especially clever but more something that would have been a huge bummer if it hadn't happened : it seems like the Pro Display XDR has charging capabilities way beyond what any current Apple device might require, and it's speculated that it's for the upcoming 16" MBP : https://www.macrumors.com/2019/10/04/16-inch-macbook-pro-96w...
Again, how do you even achieve that if people don't communicate ?
Through extremely well defined internal interfaces and specs ?
You don't. What happens is those features are broken or just barely work, and only once they become public can Apple finally get them working. Look at the new iCloud shared folders that's now been pushed to next Spring after early Catalina betas were wiping out people's iCloud.
Edit: you can see this explained in one of snapples sibling posts.
By the OS Mastering team dropping the ball…