I think an argument can be made for toolbars if they’re customizable with no holes barred on customizability (looking at you, Firefox, with your non-optional hamburger menu) and can be hidden entirely, should the user choose to do so. For me, toolbars as they were commonly implemented in Cocoa apps for the first half of OS X’s history are the model example here, which offer all the above.

It’s when they’re not fully customizable and aren’t optional when they grate on me.