I've always been curious if the Flash animation studio really had anything to offer in terms of usability over, say, modern HTML5 in WebStorm or Visual Studio.

I've always been curious if the Flash animation studio really had anything to offer in terms of usability over, say, modern HTML5 in WebStorm or Visual Studio. It had a huge amount to offer. Very sophisticated vector graphics animations tools with key frames, motion and shape tweening, easing, onion skinning, blending, masking, etc. You really don't see these amazing sorts of vector graphics animated websites much these days. I think that is due in no small part to the lack of tooling for HTML5 workflows.