Correct!Monocoque fuselages were given up for a reason. Unless you go with ultra rigid composites, you need a pretty thick and heavy tube to do what a semi-monocoque structure will do.
The vast majority of modern airplanes are semi-monocoque. They started as simple monococques, then added stiffeners around doors and windows, then bulkheads, etc.
At minimum, monocoque need to be thick-walled with foam or honey-comb separating the inner and outer skins.