Good sign of immersion into a game:
Interesting concept i’ve seen in video games - session games with fast repeatable sessions lead to burnout.
For example in Apex Legends you can play really intensive - land to the site, die, launch the next game, play again. Constant action, constant frequent emotions. This leads to burnout, missing details, constant dophamine injection.
Burnout happens because of willing of 100% action time every second of the life. Proper immersion helps us to understand game better, and get healthy emotions from it.