Just want to point out that “rotoing” isn’t only about tracing a figure or object for 2D, which Walt Disney famously used for Snow White’s 1937 dance scene.
Rotoing today is mostly used by the VFX industry to remove objects with a mask without having a green screen. You literally adjust multiple mask points frame by frame to include only the desired object.
Davinci Resolve has a great auto mask feature for this which intelligently adjust the mask each frame to encompass a given object.
Edit: Sorry, I didn’t see that you described using control points in Resolve, so you’re basically describing the same technique but modified for 2D.
I’ll leave my post up just for another confirmation for the OP.