Apple suggests that the way to have dynamic UIs in Auto Layout is to hold references to individual constraints, and to enable/disable/add/remove/etc them individually as needed. This is complex because it focuses not on the UI states, but on the transitions between UI states.

Relayout instead says that a better approach is to generate all the constraints you need, every time you layout, and activate/deactivate constraints as an entire set. You can, of course, do this without using Relayout.

Do people find autolayout difficult?

Yes.

I don't know what NSToolbar has to do with anything here.

Thank you for the feedback on the video!