i’m going to move it from drop down to sidebar on my forum. i like that it is more similar to the mobile view that way. i think my users will grow to like it, especially with the manually expanding and collapsing sections and the menu itself. i think the desktop users (of which i have many) will like that it can stay expanded.
after using the navigation menu in drop down hamburger mode for awhile i personally much prefer the sideburger.
i know some of my older users will complain at first but i can always blame Discourse lol 