[sliken]

Normal homes these days have quite a bit of competition for wifi. Hell even today's watches these days have wifi. Add a kindle, a few security cameras, a few laptops/tablets, a few phones, etc. Then add some crappy/noisy LED bulbs, a cheap microwave, and various consumer electronics and wifi is far from a sure thing for streaming 4k video over... especially for hours at a time.

I had some network lag/dropped frames, turns out my stereo receiver was downloading a quite large firmware update. Had me freaked out a bit, I hadn't recorded the mac address. Didn't figure it out till I turned the TV on and saw a dialog asking if it should upgrade.

So, yes, generally I'd recommend that anything that's going to consume hours of 4k video be put on ethernet if at all possible.