When the TV stream is 1080p 50hz, then my TV looks much better at 4k50hz . I guess in countries where 30/60 Hz is standaard, there will be not a problem. In in my case ( and I am sure also apply for other EU customers) when the box switch to 4k60hz, picture is stuttering. Anyway I hope is possible to fix it. I did try everything, all HDMI ports, different cabels, hard reset, soft reset, HDR off, HDMI CEC off , etc.... Will have to wait and see, I am sure is not a big deal to fix, as any other device I have tried don't show such behavior.
P.S. I agree that using My Tv online with AFR, probably is not a problem. But watching with provider's app, without AFR, then I prefer to keep the resolution I chose