Regarding the first screenshot (and obviously it is only my opinion), I would hate that immediatelly 
I do not see the appeal at all and it would be a LOT of work to completely redo The whole style of OGS into that.
However, I can understand the second screenshot if we are talking about reviews where one is expected to write or read larger ammounts of texts and also navigate the tree. We already had a discussion about the idea here: [Solved] How to make right-col wider? There is a quick fix you can deploy locally to achieve the effect, but I would really be hoping for a sitewide implementation. Either someone takes it up, or I will finally hype myself enough to finally start contributing to the code as well once I gather some free time.