That seems like a real problem given they are a people being actively subjected to genocide which is being censored and distorted by western media, who have their land stolen, their existence denied, and been subjected to apartheid sponsored by the most powerful nation in the world (the US no less) in flagrant violation of international law for over half a century. Abuses and genocide carried out by a regime so powerful, so important to US interests that there are multiple states in the US where you can lose your job or your business contract for simply voicing support for boycotting and divesting from the apartheid regime that is an illegal colonization and occupation of stolen land by radical far-right reactionary ethno-fascists operating under the cloak of religion. Most major western media are some degree of complicit in giving one-sided pro-apartheid state slants, omitting key details, and using dishonest framing to attempt to deceive the public and manufacture apathy and complicity.
Doesn’t exist and frankly not necessary. At present nothing needs this much RAM and I say this as a power user who runs a local media server and is familiar with concepts such as running Plex with remote transcoding on devices such as the Shield. The only things that come close to this much RAM might be recent generation gaming consoles like Xbox or Playstation but they don’t run Android and aren’t built for streaming, remote controls are third party accessories.
Other problems: I’m unaware of any devices even without the high RAM request that exist that fulfill all of those asks. Particularly 4k 120hz seems to be something no one has any interest in putting in a streaming box despite plenty of them having HDMI 2.1. I checked and even Apple TV 4K’s do not support 120hz despite having the right hardware for it.
Fact is commercial streaming services which these devices exist to cater to have no interest in 120fps/hz content, even 60fps with dolby vision is kind of more bandwidth than they like using and they upcharge premiums for it.
Basically your choices are (all these assume giving up the RAM ask):
Other options if you’re willing to give up the 120hz demand would be the Nvidia Shield Pro. As to a remote that controls everything, I believe the Dune-HD remotes do have that capability but honestly your wants are really specific and high end. Most people would use two boxes if they HAD to have all you’ve asked for.
You might also consider waiting to see if Valve does release a streaming device like they’ve teased. If Valve does something like that it might finally be the golden one that has 120hz support though you’re still not going to get 12GB of RAM. But you’re looking at waiting a year at least I think even if that does materialize and it may not.