There are even areas in which some of those best IntelliJ IDEs.

One such thing that Xcode has that IntelliJ doesn’t is per-pane history. In Xcode hitting back/forward navigates history for your focused editor pane whereas IntelliJ’s navigates history across all editor panes.

This might sound like a minor difference, but Xcode’s way gets me to where I want to go more quickly most of the time because I’m not having to wade through the likely-irrelevant history of the other panes. It’s a frequent frustration whenever I have to use an IntelliJ IDE.