I mean, except for Tizen OS isn't most available? You can find the client for Android, Android TV, Windows, Linux (Flatpak), macos, apple ios, and more.
https://jellyfin.org/downloads/clients/

Don’t ever connect a “smart” tv to the internet. It’s only going to become shit and steal your data.

Raspberry Pi, old pc or any kind of other external player will always be better for connectivity and control.

A Chromecast TV device might fill your gap. There is a jellyfin android TV build in the app store and it works with every TV. Just costs about 50 dollarydoos

I had the same experience with my parents. They have a Samsung TV and the Jellyfin experience was awful.

I ended up getting them a little N100 mini pc and installed Bazzite and the Jellyfin app from Flathub. You can configure it so it knows it’s on a TV, and responds to keyboard controls. I got them a remote from a company called Pepper Jobs that gives keyboard input and now they have a great experience with it. Even my mom, who’s a big technophobe, loves it.

My dad also has an LG TV in his workshop that doesn’t have a working Jellyfin app (cause it’s ten years old), and he uses the Jellyfin app for his Xbox on that one.

I love Jellyfin, but I always find something that I have a problem with when trying it, for example it has weak searching, tagging, and TV show identification compared to Plex.

I tried using it even as recent as yesterday for some searching and tagging, but it's searching, tagging, and even TV show identification has problems and is weak in comparison to Plex. I couldn't mass-tag certain videos which was annoying for me, I had to do it one-by-one and it ended up taking a long time, that was frustrating. Also, tags don't show up in searches anymore because it hurts performance apparently. With that said, maybe Plex has the same limitation, but it doesn't mean that Jellyfin has to. They are open-source, and they can be better than Plex, and in many ways they already are, but I keep running into pain points with how I want to use it, and it does feel a bit unfortunate. With that said, I'm a developer too, so I know it's not always that simple. It's just in some ways it feels less "complete" than Plex.

I'm still really pleased with Jellyfin though, and especially the future potential of it.

You can access Jellyfin through a browser, too. Is that an option for the Samsung TV?

I can speak from my experience with an Apple TV, the application "Infuse" works amazing with a jellyfin server. Though the application is essentially $1 month subscription, but works across all your apple devices, if you have any. I think it's worth it.

Additionally, the official app for Android TV worked pretty well when I last tried it on an Nvidia Shield

I use Jellyfin client on my new Samsung TV via a Google TV dongle (ONN tv, $25 at Walmart). Seems to work well.

My only complaint is the stream volume has been very low after a recent update. Downsampling helps but seems like it shouldn' t be necessary.

I run an Android TV box on my Smart TV, because I don't trust them on the internet.