Are people having this much trouble adapting that a dev had to step in and explain the decision making behind this all the way to it's technical aspects? Holy f... how about we all give it a few days to even try adjusting to it first?
Who knows, maybe the current design benefits new players more than appeasing some of us who refuse change because it's the easy way. As anyone who has worked a bit on his UI weeks after playing on default can tell you: even small changes which will definitely improve the experience later on will make it harder to play... for a while. Give. It. Time.

tl;dr: Get good and stop saying 4:3 is better than 16:9.