There is that too!
Actually, it's not necessarily a less advanced method--what's being described are just different methods and they can be used in different situations to produce similar or very different results by choice.
The rig/character switching method is really not so different from what I do in Harmony at my work place. (I mainly use this approach because Harmony has no equivalent of Smartbones.) The trick for getting smooth transitions in rig-switching is to design your character so you can shift internal elements to create 'in-betweens' before you make the switch. For example, before making the switch between front to side for the head, shift the facial features in the direction you wish to have the character 'turn'. Depending on the animation, I might do two different frames for smoothness or if it's not critical, just one 'in-between' and hold the pose for 2 frames; then I switch to the side rig. I may do an 'in-between' frame from there to complete the side transition. (I've even used the same method when animating characters in After Effects using DuIK.)
For my own personal projects using Anime Studio Pro, I use rig switching often, sometimes to transition from one
front pose rig to another
front pose rig. For example, in
Scareplane, when Sister unbuckles her seat belt and sits up, there are as many as three rigs involved: a sitting pose rig, the unbuckling, and the standing--and some elements are the same for the duration, like the head. (Okay, I guess that might be might sound like an 'advanced' technique...except this scene it was my first Anime Studio animation created when I was still learning the program. Actually, while I may not be a beginner anymore, I still consider myself learning.)
Try out all methods you read about and experiment often on your own. Save a lot of variations of your scenes so you can back up from any 'failed' experiments. You'll eventually find that no single method is optimal for every situation but if you know more than one method for rigging and animating, you'll be ready to deal with any difficult as you encounter them.
Have fun, and if you get stuck, come back here with questions. (And pictures.)
G.