(This was supposed to be a longer post, but the Flow dingo ate my baby, going to keep this short.)
- How will proposed language switcher look at the main pages, where there is no first heading? Will the old menu still be available to users without JavaScript enabled (that is interesting to me because I would, in all likelihood, want to disable this interface for myself even when I browse anonymously)?
- Why are the designers thinking that hiding sidebar behind a button has any possibility of not harming the clickthrough rate of the sidebar items? That contradicts all available research and the basic common sense (since you require more actions to get to those links, it is only natural that less people would take them). If the links featured in sidebars are considered non-essential for any readers, the WMF should just put it bluntly instead of saying that this will be tested with A/B tests.
- The idea to replace already non-recognisable (for less proficient Internet users) hamburger icon with even less recognisable icons is rather strange. If anything, the knowledge that hamburger icon is non-recognisable should trigger research into how to make existing navigation more helpful without hiding it, not into replacing with even more obscure icons.
I am glad to hear that fixed width was supposed to be for everyone, not just for readers. I also think that that is the most controversial part of the proposal for the regular editors (but not for me).
Also, even after reading the report, I still have to say that all the provided prototypes look worse and more unappealing even than the existing Vector skin, and I hope that this would be mitigated by the time these improvements would start to be developed.