High end processors - impact to video quality


So i have a nice lg 4k smart tv with hdr which is nice. Most of my video comes from netflix, prime, hulu, youtube, etc thru apple 4k box, really nice. Occassional bluray disk.

so what will all the fancy video processing capabilities of a high end processor do for me? Seems like alot of hype that may not yield much improvement beyond what im getting.

I am buying a better processor moreso for improved audio.

jumia
aux input. 
Ditch the "sorry" for a valid observation.
I heard an oh so slight "improvement" ar the Axpona '19 demo. Or was it the coaching?
Either way NOT WORTH it
NO, not only that but I tend to find the streamer in my TV is better than external boxes, like Roku.

What this means for me is that my HT processor doesn't really do any switching. The TV is the video switcher if / when needed.
Erik, tv aps for streaming may be ok for vid but sq i find is not so good.  Eg. Tidal and spotify aps on smart tv sound really muffled. 
Audio is the challenge, video not so much unless you like hdr which smart tv aps may not have.  Apple tv box has hdr and if tv can handle hdr signal its nice.