In reality I do 4-5 proposals different. I made the last only in response to this thread and I can’t find the other proposals.
The problem is known
There are no tabs where you can put addons that can enter other categories, such as create, edit,… where the developers can put things.
The T-shelf was removed, which allowed to divide the viewport in two easily distinguishable panels and more space for tabs
There are many ways to solve the problem. The right one in my opinion is to return the T-shelf to its place of origin with some predefined categories where the developers can put tools without having to create their own tabs as a side effect in 2.79. And to separate the addons without categorizing, in the same tab bar or that only use the sidebar the addons with own tabs. It would be a very good solution, tools on one side, addons on the other, so we can make a better mind map of the program, as in 2.79. Right now the tools are spread all over the interface for no reason.
But that’s at a hierarchy level, at a technology level there are also many ways to fix it, icons, lists, tabs that can be without selecting anything, buttons instead of tabs…
The problem is the same as always, with the movement of everything to the sidebar. And forcing it to be on the right any solution that is adding icons next to the icons of the property editor does not look as good as on the left of the viewport. With the sidebar on the left, this problem would disappear.