"Oh wait Roku has both of these things."

I greatly enjoy the wired ethernet on my Roku because nothing wireless interferes with my streaming.

Wireless + streaming = bad experience. Oh sure, plenty of marketing, and plenty of wishful thinking that it would be really nice if it weren't true. I've had my rec room roku hooked up wireless and wired and I'll never voluntarily stream wireless again as long as I can plug in a cable. Just better / faster / no interruptions ever.

I agree. What would be perfect would be if devices with ethernet ports could bridge the network to hdmi-attached devices. I think this is technically a feature of hdmi, and would be a matter of programming for a device maker like oppo to integrate.