[ThatGeoGuy]

I for one very much dislike the three column design. If you're like me and try to maintain "Inbox Zero", and archive everything useless or not requiring a reply in the immediate future, then a UI like this is wasted as there ends up being a very empty column in the centre.

Further, in tiling setups (tiling WM or just having more than one full-screen window open at once on one screen), this approach is even more wasteful, as you may not have 100% of your screen width to accommodate such a UI. TI get that people want more and more of their interfaces to be consistent with the "simple" mobile app design from the last 2-5 years, however I can't help but feel that the re-design provided by the article is more suited for people with vastly different email usages. As another comment has said, keep options open.