[CiNcH]

I'm just trying to see if I want to keep it and that decision will be based purely on if I need DV and YouTube VP9.2. What I fail to understand is DV/VP9.2 a hardware, software limitation or both? Since DV is built on the HDR10 I would suspect the TV can and will work with say a Nvidia Shield and the same for YouTube?

I don't really understand everything you are just writing or asking here, but these are the facts concerning YouTube HDR and Dolby Vision on a 90E:

- 90E will never get Dolby Vision support. So even if your external box can do it, you won't be able to enjoy it with the 90E as both sides have to support it. You are limited to HDR10 and HLG. Only Sony TVs based on the X1 Extreme image processor will receive a respective update.

- YouTube HDR is currently not supported even though the SoC inside 90E can actually do VP9.2. I think that this is a Sony/MediaTek related issue, not implementing latest Nougat HDR APIs. Or why would Google hold back YouTube HDR for their own Android TV platform? I am quite confident that there will be a software update sooner or later. Since YouTube HDR is currently using HDR10 only, you can at least enjoy the content via Chromecast Ultra.