If your SAT scores are between the 50th and 75th percentile at a top LAC to which you are applying, and that LAC is test optional, could there ever be a disadvantage to submitting your scores?
Let’s think about this logically.
If you’re a college who doesn’t require scores, the majority of people who submit scores would be people who believe they are good enough scores to be considered.
If your scores are better than at least half of the people who believe their scores are good enough to submit when it’s not required, there would not be a disadvantage.
tldr: If scores aren’t required, then the submitted scores will be higher on average. If your score is higher than the average, submit them.