I would have just liked the pinned state (from my Mac) to have been synced over when I clicked on its iCloud tab on my iPhone.
For example, say there was a long webpage that I'd been reading on my Mac and I'd only got half way through reading it. I would have liked that when I clicked on the iCloud tab on my iPhone for that particular webpage, that the pinned position (halfway through) would have carried over from my Mac.