Personally, if they just went away on large screens, I'd already be much happier. So many programs I use on my 30" monitor have gone from a readily available quick-to-navigate menu-bar to a horrible hamburger menu that is so self-conscious about using space that it is 10x slower to use than before.

Gnome (and maybe GTK as well?) submenus now require a click (as opposed to the previous hover) and replace their parent menu (rather than appearing beside it), making hunting for something in a submenu an exercise in frustration. Considering that:

1. The fraction of Gnome users on a small touchscreen is approximately zero

2. You can always support the miniscule number of small-touchscreen users by having menus behave differently on small touch screens; Apple still has a menu bar on desktop applications!

It's particularly frustrating