It’s not about responsiveness but about the space it takes on the screen and the fact that the more elements you add the more cumbersome it is.
What I also don’t like is the submenus shown in the page content. I think it’s cumbersome to fold/unfold an entry.
Overall I feel that the current menu is a better UI that is easier to understand and navigate. The downside is that it takes more horizontal space but ATM I haven’t seen a proposal where I thought to myself that the tradeoff was better. It’s good to have more horizontal space but not at the expense of usability.
I’ve never liked option 1! For the same reason mentioned above. I don’t understand at all the need to have the submenus in the main content area since there’s a menu on the left. You loose everything! Both screen estate and usability.
What I said I like the best so far is option 1, but without the extra menu in the content area (what I call the submenus), which is what we have now basically but with a difference: directly navigate to a subsection and display its content, ie no special home page for the Admin UI.
I currently really don’t like the accordions used for the submenus, in the main content area.
One alternative that wasn’t shown I think, is the ability to somehow fold/hide the current menu when you’re on a topic, with the ability to hover over (or something like this) to unfold/unhide it and navigate to some other section.
I also want to mention that when I talked to you about improving the Admin UI, it was mostly about changing/removing the main content area (which currently duplicates what’s in the menu and should be removed IMO), more than other changes (I find the current menu to be really nice and usable).
Thanks!