This command worked only for 3D beam-column elements but was later extended to visualize 2D and 3D beam-column elements, shell elements and 3D brick elements. After a long time, a new function to plot deformed shape of the structure was added by another user.
The Python interpreter of OpenSees i.e. OpenSeesPy has several advantages over its Tcl counterpart in terms of plotting and visualization. In January 2020, visualization functions were first added to OpenSeesPy to visualize model and mode-shapes by using only a command.