You find the motivation for revisions (hopefully not for a complete rewrite) because you want to finish the darn thing. If you don’t, you may have wasted all that time and energy. Besides, I want to pack it off to my editor so it can begin the journey to publication. My tenth novel is waiting patiently on my computer for a final re-read in three weeks. If there are any, they’ll be minor, I’ll fix them, make sure the ms. is formatted correctly, and send it off.