I fully support the removal of frames. I know there may be challenges with end-users learning a new UI/UX but from a technical perspective I think continuing to try to support frames will be unsustainable, espceially as we move towards a modern modern structure for the UI.
I’ve looked at how the menu is driven and honestly it needs to be rebuilt from the ground up. If we had a JS guru this would be a great place to go full Web Components and JS to drive the UI.
As far as the actual mobile usabiliyt, I think a solution could be collapsing a LOT of the Admin menu into just 5-6 submenu links and handling the other options on the actual page using a left-sided menu. Another alternative would be to break items after 5/6 items and float them next to each other.
I’ll put together some mockups of how I think our menu structure should be. One thing that irks me is how disconjointed our UI can be. Thsi may be a good time to identify ways to standardize our user intaface adn improve the overall user experience