As we now know, we have to make several layers and set the time apart manually, and then blur to achieve motion blur.
Is it possible to have a array filter (like array modifier in blender). What it basically does is copy the already masked video and create copies of it in the number specified by a user, and gives a option to delay the time between each clip. Then it should have a option of “blur arrays” And “array opacity” To further customize it, and keyframable trail direction for full control. It would work as a motion blur filter without the official finished release of the actual motion blur filter.
I believe most of it can be done with filter sets, but I am not sure about copies of the clip part.
The vertigo filter and trail filter does help, but not to full extent