If you're planning to run plex and can easily fit one in the case, I would. It doesn't have to be super new or anything either.
I've gotten by without a GPU but I have 32 cores allocated to plex and it will still struggle sometimes with a high bitrate 4k video transcode. If I could find something decent that would fit into an R630, I would.
I'd love to, which is why I was saying I would if I could get a GPU to fit in my 1u server chassis.