Flash as an embedded media platform was a blight on browser security. But strictly as an animation tool, it was pretty nifty. You can even use tools like Swivel to render Flash animations to video.
In the year of our lord 2024 there are probably way better tools than Flash ever was to do this sort of thing. But back in circa 2011 it was the best tool of its kind I knew of.
Blender has got to be one of the most hilariously vertically integrated apps I've ever seen. Next thing I'll hear is it can file my taxes.