I loved Roku but they lost me when their latest model would only show regular 1080p on a 2K HDR-10 screen. And yes it supports HDCP and all that crap. Roku just never tested downscaling apparently.
I bet it affects many people with HDR monitors that aren't 4K, there's tons of those.
A good percentage of users that hook up Roku to a PC monitor will run into this.
Roku only supports HDR at 4K and normally I can just set youtube or whatever to "4K HDR" and OS downscales. Roku won't do it.