Yes, I know what you mean. I gave up on Adobe Animate.
Pixi is great for anything that is a texture, then it is really fast. Otherwise it is not a flash replacement.
I do not use it for vector animations, but spritesheets or a webm video overlay is what I would use in your case.
yeah, I really didn't want to use video. The vectors are around 64kb per cut scene. I don't want to create several Mb worth of mp4s for each one.