Watching Carlsen during the last several games, I get the impression that he is not himself. Maybe he is ill, maybe exhausted, or maybe he is just burned out on chess right now, but for whatever reason he doesn't seem to have much energy. That low energy level is the only explanation I can think of for his bizarre draw offer today. Sure, the shorter playoff time controls favor him, but so did his position today. Why not end it when it's right in his grasp instead of heading into territory where he's only favored? I think Magnus is being affected by something beyond his control.
I think you're 100% right, there. Magnus' sister Ellen has said that she thinks Carlsen will retire from chess should he lose the match. Whether that's the case or not clearly remains to be seen, but for a long time (since before he became World Champion), I've had the feeling that Magnus won't have the motivation to continue to play chess for much longer than maybe age 30. He's now been the World Champion for four years, and the last couple of years haven't been desperately successful for him, at least not compared to the 3 or 4 years prior to that. His play feels a little bit stale, or rather his competitors have upped their game, and it's now time for Carlsen to do that to his own game. Has he got the energy to do it?
Embarrassment to these forums are people, who are posting threads with title like this. One could argue with his decision and motives, some GMs would continue fight for win from this position (Fischer, Kasparov) but calling number 1 chess player in the world (arguably in conversation of being GOAT of the game of chess) embarrassment is beyond ridiculous. At some point he had a chance of big flank attack, but opted for safer option, and in final position there were no continuation where black could achieve breakthrough without taking BIG risk (possibility of losing game and match without second chance). It was clearly strategic decision, and we get to see how it works out real soon. More than that we get to see more games of this 2 great players!
One could also argue, that Caruana also "being" chicken at one point getting slightly better position, but few times playing passive moves and in result getting inferior position as white. Some people are delusional and don`t realize the pressure of playing World Championship game (especially last game) there human beings playing the game not machines and stakes are EXTREMELY high. Some people take risks go "balls to the walls" some people choose safer approach. It`s all about personality, not that so-called "heart of champion" crap. Guy has been undisputed world champion for 5 years, defended his title 2 times and for sure he knows a thing or 2 how to win few games of chess and when it`s good idea to take a step back and prepare for next games ahead.