Greetings - the fact that WordPress users can now, and have for some time, been able to host and display their own videos is a wonderful thing. The fact you can make a video playlist is even better right!?
The problem is this, you upload a video and then have to go to media library, edit and set a featured image. This is not a great solution and is disruptive to a workflow.
May I propose that when you upload a video via add media in a post / page etc that you can set the Featured Image.
Another wonderful addition would be to set a default featured image for all uploaded videos once. This way you could set this up for clients so when they upload video media to a post etc they don't need to do anything else, but if they do set an image specifically it would overwrite the default image setup.
I can create some example screenshots to help visualize what I mean if needed.