Personally i use AdNauseam but if i click on uBlock button and then select "more" twice i get similar interface to uMatrix. Are there any features lacking in there compared to uMatrix?
uMatrix had a much better UI which allowed finer granularity and immediate feedback when blocking this or that for a given site.
So to test if I was remembering correctly I just played with the ublock expanded list a bit. You can click on some things(but not everything) and the color changes(sometimes). but I still could not figure if it is just a status display or if it can be used a a tool. As far as I can tell most of ublocks power is hidden inside scripts with no real ui.