No, it's not ok. Everyone deserves at least a participation medal in today's world. You have to reward them, because you wouldn't want them to feel left out, now would you?
Ok, seriously, the food is cooked, it doesn't matter if you heat it or not, that's you preference and what @john.jcb was saying.
Depending on how thick the piece of meat is, you can also rewarm as part of the searing process.
Lastly, I agree with John about the fish. Unless you are cooking it for use in a cold sandwich or salad, then I wouldn't reheat that one. Just my 2-yen.