I can’t speak for any specific version - but for awhile it was the same for me, but they eventually made a WebOS official release so I no longer have to fuss with developer mode.

Since it can’t reach the Internet since that point ( maybe a year ago?) I can’t vouch for if any update would have broken that

WebOS app for me has been working like a champ for a long while now. It’s so nice that it just works with my existing remote and everything.

Blocked all traffic to my TV at the router except local, and now it’s a beautiful, free beast. Love the jellyfin crew.

I’ve only just started looking myself, but theres agora online

https://agoranomic.org/index.html (the hamburger menu has a how to play option)

Also: https://blognomic.com/

How does deck + phone work? Your phone uses the speakers on the deck for playback?