They’re probably talking about Samsung TVs, not their android phones/tablets. Installing jellyfin on those things can be a chore. My experience with LG was similar. The official build was out of date and riddled with issues that didn’t exist on other versions. It refused to play videos that worked well enough on other devices, transcode or no.
Compound words are very different than agglutinative conjugation though. In such languages, you don’t just mash words together, you also modify them to encode all sorts of extra information into one word. You can form full, grammatically correct sentences that way. Can’t do that with compound words because you can’t compound them into a complete sentence.
A famous, powe example is the word “çekoslovakyalılaştırabildiklerimizdensiniz” from Turkish, which is like Finnish in that regard. It’s a complete sentence that means “you are one of those who we have managed to make a czechoslovakian”. The object, subject, verb, tense, and more are all in there. Obviously that’s quite a bit more complex than word together-mashing.