This reminds me of something I've considered. I will take images of BIF against a blank sky just for nailing focus practice; I can assure you that doesn't happen all the time. I have a gizillion images of a BIF against a blank sky. I don't know if this image was just for BIF practice or what, but I have concluded that BIF against a blank sky, or even against a few clouds really is not that exciting, other than perhaps for a record shot. Outside of nailing focus, I try to capture the bird doing something, hunting, or landing or taking off or fighting or carrying a stick or something; or have something more interesting in the background, say landing on a dock or a pier or on a tree.
The cold hard truth is that once one can nail focus reasonably well, and can operate one's camera by muscle memory, then it's all about fieldcraft; knowing where and when birds are around and how to get relatively closer within reason, at photogenic locations. It took me awhile and after a lot of trial and mostly error to realize it's not so much about the camera as about working on one's fieldcraft skills. This image just reminded me of all the ones I have of a BIF with nothing else going on. I realize your specific question was about the motion blur/no motion blur, but this is what the image brought to mind for me.
