Hmmm.... why??)I would understand that his weakness had to be explained somehow, but this is another point - why…
he should be getting sicker with every reset. in the reset before the final one, he was already coughing up blood. Felt they just buried this condition for a happy ending.
It would have been more logical if he died or was gravely sick. He was getting sicker and sicker in each new reset to the point where he was coughing up blood. yet in the last reset nothing happened to him. This was a plot hole that they just buried for a happy ending.