Swiftfin is NOT Jellyfin!

Forgive me if this sounds like a rant (perhaps it is), but I've been using the Roku Jellyfin client for a while, and I like it... I recently was "forced" to buy an AppleTV 4K because my NAS processor cannot manage to play 4K media files without severe "stuttering". With Apple, it's the same old game - they shovel manure into their "AppStore". One of the worst examples of such manure is "Swiftfin" - the app whose author makes it sound like it is an "official" Jellyfin client - but it is not even close to the Roku Jellyfin client!

As I said, I was perfectly happy with the Roku Jellyfin client. Its user navigation and interface were closely matched with the Jellyfin server, and AFAIC it worked beautifully. After receiving my AppleTV 4K box, I went to Apple's "App Store", and searched for an app - expecting to find the same app that Roku provides. Instead, the app that "sounded" like the real Jellyfin client turned out to be "Swiftfin" - a hulking piece of shit!

Back to the Internet for more "research"... it seems that the Jellyfin team does not make a client app for the Jellfin server?!?! It certainly IS NOT Swiftfin! The closest seems to be a "paid" app called "InFuse". I feel lied to and fucked over by the misinformation agents of The Internet - supreme time-wasters, liars and miscreants. Why can people (like the Swiftfin author) not simply be "HONEST", and say that this is an "app that tries to emulate the official Jellyfin client that is not in the App store because ..." ?? I guess the answer is that some people are simply DIS-Honest.

OK - rant over, and now I have 2 questions:

1) Is there a way to install the "real" Jellyfin client on AppleTV 4K? And if so, is this client capable of summoning the Apple hardware to perform any required transcoding?

2) Is the situation any better with the Nvidia Shield box?... IOW, can one get an "official" Jellyfin client app that runs on Nvidia Shield that interfaces with the SHield's hardware to do the heavy lifting?

Thanks,
~S