I already know there is not one single answer to this question.

One person would argue that having a TV showing a fireplace with fireplace noises is immersion, another would argue that having a TV there at all is breaking immersion (this question came to me while reading a thread by a DM who wanted to display pictures but worried having a TV would "destroy immersion"). But what does immersion actually mean to you? Is it descriptions making you "see" or "feel" the environment? Is it roleplaying so hard you cry in real life when your character is sad? Is it simply the time flying by and the outside world fading to the background in favor of your troubles and quests of a dnd world?

How much immersion is even possible? Even if you take a horse to get to the session, dress up, lock all electronic devices away and play by candlelight with a real ink quill, you still have a physical character sheet with numbers that don't exist in the game. Your DM still has to say "make a perception check", a thing that isn't immersive. What is the max amount of "immersion" you can accomplish?