I'd be jumping, and leaping, and praising God if we could do polls on every area of the site. I've used other sites that have this capability, and it has always been very helpful.
I could vote even if I don't care to leave a comment.
Those who wish to comment are not hindered in doing so.
I could see at a glance a summary of opinions without having to scroll through all of the comments. (Using the computer to scroll down and mouse click hurts my arms. I have to limit how much I do that.)
I'm sure I could come up with other reasons, but these are a good start.
I'd also like the ability to add an emoji like Facebook allows if anyone is listening to other suggestions.