How many times have you accidentally hit the 1 or 2 key in object mode and watched as your collections disappeared? And then you start clicking through things trying to figure out which collection it was and which objects were visible in that collection and which ones you had hidden?
This interface is a holdover from the pre 2.8 version of Blender. Not many people still use it yet it occupies a very prominent place in Blender’s user experience. And, it creates all sorts of problems as we also use the 1, 2 and 3 keys to toggle between vertex edge and face mode when in edit mode.
Perhaps the original keymapping, with the “layers” checkbox interface, may have been a good idea (debatable), but the current model, without the limited “layers” and most importantly with the new keymapping of 1,2 and 3 in Edit mode, is a UX nightmare and should really be addressed. It’s a huge point of confusion and frustration not only for new users, but also existing users.
I know the Shift + 1,2,3 etc will bring them back. 1) That is unintuitive and mostly unknown; 2) Instead of just toggling (and inverting) the original press of 1, it instead SHOWS collection 1 (which is already displayed). Again, most unintuitive. This means for 9 collections, when you accidently press 1, you need to press Shift+2, Shift+3,Shift+4,Shift+5, Shift+6, Shift+7, Shift+8 and Shift+9. Really?
And I know you can also UNDO, but if you forgot to undo and did something else next, then wanted to get back to the original collection display, it’s all but impossible.
I posted a video to my Patreon showing how to disable this.