Test optional does not mean the test scores aren’t considered for those who submit them. It’s generally an advantage to submit a score at, or above, the median admitted score. Some people will say an advantage above the 25% mark. Depends somewhat whether or not the applicant is hooked.
Without a test score, other components of the application become relatively more important.
For some students that’s not a problem…they have a strong app without a test score…a strong GPA, high rigor, strong essays, ECs, and LoRs. Other students have a stronger app with a good test score.
Test scores will still be part of the admission decision process at TO schools, and not every school will become TO. There are TO schools which still require a test score for merit aid as well. All DI/II recruited athletes also need a test score.