Vlad Summarizing the last few posts here, we seem to have reached a consensus on the following issues/features:
#8917
The bigger margins will help separate the tabs better, and the chevrons being embedded in the tab icon will also prevent the tabs from jumping left to right.#8933
Having a separate panel for all the non-vertical tab sidebars on the right hand side will make the behavior related to hiding/showing those tabs while in vertical tabs mode more intuitive, currently there are a few recurring issues regarding hiding/showing the other sidebars while in vertical tabs mode, which would all be fixed.
For now I would encourage everyone to either show support or express their concerns regarding these two issues. Once their future is decided, more divisive topics can be discussed.