Some questions and / or observations: 

- the Sidebar Menu offers a lot of links.  The (regular) browse menu on mobile offers much less links.  I'm guessing you have an option per link on whether to show on mobile? 

- Bottom mobile menu is nice.  This is a well established design theory by Luke Wrobleski from Google product design, but I actually thought many mobile apps were moving away from the bottom menu because it overlaps with some built in browser or phone options.  Thoughts? I don't think there's one right answer, just more interested in your perspective.  

- traditional view of menu only offers single row.  I already do this on my primary community today (not because of any special study on design theory, but for simplicity!) but would be interested in your perspective in why you're imposing this approach.  The current Menu structure already encapsulates this and more. Why change it? 

- performance improvements.  You removed JavaScript and a lot of CSS.  But then we also need splashy grid pictures of our latest trip to Australia and croc suit for the new Forum Feed / Big Grid view!

Invision Community v5 will come with a voucher for this*
 

 

* this is a joke

 

When is this coming? Looking forward alot to dark mode.

Its actually being tested at present 🙂