It depends how it is done. I used to think the same way, and I would never hire someone without having seen them program live.
But having experienced leetcode-style interviews on the candidate side, it's clear to me that they are no longer about figuring out and coding a solution on the spot. Interviewers expected a solution FAST, and to match that you need to have studied and learned the answer beforehand.
But having experienced leetcode-style interviews on the candidate side, it's clear to me that they are no longer about figuring out and coding a solution on the spot. Interviewers expected a solution FAST, and to match that you need to have studied and learned the answer beforehand.