how about let chose the users/admin with a front/back-end option?
for example, someone would like to have front and center AND in the off-canvas, others only in the off-canvas menu, other again only in front and center.
For example IMHO it's better to give more real estate to the content and put the sum of unread alerts (unread convos + unread alerts) over the hamburger menu and have them "exploded" in the tabbed off-canvas menu.
Look how much real estate alert/convo/profile get having them full visible and scrollable in the off-canvas menu.
Again this is just something I truly believe should not be hidden behind an off-canvas menu.
I think on mobile it should be a single click to access alerts/convo's especially when there's plenty of room for those icons to show up there.
Like I said I'm open to the idea of the sidebar behind there but I really don't see me coding in alerts/convo's like your example, just being up front and honest. The fact that the sidebar is easier to access than alerts/convo's/what's new/account just makes no sense to me.