Thanks for bringing attention to your post via LinkedIn today, I missed this one last year. This technique is definitely on trend, though I've found it really adds to development time that seems lately to be in short supply. Sometime I use it's simplified "cousin" with motion path animation of elements. But it's a great reminder that using it, of course never gratuitously, can bring some content to life.
I'm reminded of a few years ago when learning about animation at UF, and the development of US motion picture and film industry. Even childhood "flip books" are the same idea - "motion picture" -- put them together and move them quickly and you have 'short movie' which brings those still images to life.
Last thing to add/share on this is I attended a great webinar this week hosted by eLearning Brothers (love their stuff and have no affiliation with them in full disclosure) on how easy it is to use Vyond to create motion animated videos as standalone artifacts or elements you can easily incorporate into Storyline, Camtasia, etc. in much less time that with, say, After Effects if you even have that app. It's come so far from the early GoAnimate days; I'm thinking how I can use one in my next project!