Movieclips do not use hardware acceleration, so a feature must be added to render the bundle symbols as bitmaps. (Required for optimization.)
You can “export as Bitmap” from the property pannel at the Render section in Adobe Animate.
cacheAsBitmap is not stable for movie clips from bundle.
when processing a bundle, a feature such as a conversion to bitmap should be added.
flash runs swf much faster than bundles
It really depends on your usage.
I use Adobe Animate for layout and simple animations and it’s enough.
When I need complex animations, I use Spriter (but I could use also Spine, Dragonbones, or Creatures).