please make going back to the basic interface an option. I tried the new one years ago but went back using the /b/ option in the URL. Now you've forced the "new desktop" on me, and I have tried it - I still don't like it because it does not suit my style of working. I have tried your interface a few times over the years when providing support to other people using your interface.
/B/ (basic) allowed me to do the following:
1) - select emails without the list autoupdating.. each autoupdate clears ticked boxes/ radio selected emails which I might have planning to delete, or move.
2) - right click open new tab each email - having more than one open at time allows for my reading style, but most importantly allows me to copy text from one email to another (highly relevant for many reasons)
3) - having the folders always visible on the LHS allows for navigation
4) - the new interface might suit tablets or similar devices but is not ideal for PC type use.
5) - I don't mind change when it is an improvement - this is not an improvement for my usage model.

I'm sure there are people who like it - but I am struggling with it and will most likely move away from your web interface (and associated ad revenue) if I can't make it work for me.