May I touch the corpse?
I know there's some troubles on it, Adobe is giving a fuck about it's Flash/Animate platform, and working on it nowdays feels wrong as we always stumble on many many many problems on the way. I think there's even more reasons to not support flash, but I cant remember it right now.
The thing is, Flash is very good for prototyping. That's a good lost cause that Adobe suits will do nothing to help, but, where may you do shitty sketches with your tablet, straight on the software, and go on the flow, animating as it goes?
I do believe there's room for a very better animation software to exist. Something that would allow drawing, sketching, messing around, and, of course, decent structured animation projects with good features, as Spine does.
For the difference between Flash/Vector and Spine/Bitmaps, there's an excellent plugin that exports Flash/Animate content to Unity. It works very very nice, creating a sprite-atlas on .png, from the vector art-data. I love it.
But there's some issues: the work Flash content does on web is poor on today's standards, the plugin I've mentioned does not support changing skins yet (maybe it does today, idk), and the bone tools of flash creeps me out. Also, the Adobe's prices creeps me out.
Just some thoughts.