At 25 he isn’t actually that early into his career. Goalies just take longer to marinate.
I think he only had one RFA year left. He will be 31 when this contract expires.
I think it is a reasonable contract, he was a Vezina finalist. Some concern is justified I think on a regression in his play, just the nature of goalies.
On the flip side, if you sign him for a lower AAV, term is shorter, and he may walk in free agency. Don’t want to go back to having a big ? at the goaltender position.