@eneroth3, some people have the screen space to have just one more level of scene tabs. Many people have 17" screens and larger. Just about every person can fit around 20 scene tabs across the screen horizontally. To be able to have 20 group tabs with each containing 20 scene tabs puts it at a total of 400 tabs that can be accessed in less than 4 seconds. That is extremely fast access of many scene tabs.
Now certainly nobody in their right mind would need that many. Having 400 tabs is not the point. The point is that nobody needs more than two levels.
Of course, if you can have scene tabs that are so easily organized and accessible then people would probably start using more of them.
So my point is that why not just one more level of scene tabs that can be turned on for those who want the nested tabs and off for those who don't need it or want the screen space.
To me its common sense. I use Microsoft Excel everyday and have many documents open at the same time with an extension called 'office tab' which similar to nested scene tabs allows a person to select one tab for whichever document they want to access and then another tab for whatever sheet in that document they want to access. As soon as i started using excel i immediately realized i needed nested tabs and began searching for a possible extension and luckily it existed. Today i cant imagine working without it.
But look...I really don't want to argue about this subject matter given that there is nothing that can be done about it and given that i have found a great workaround with external references.
My apologies if i seem a little stubborn. Perhaps i am.