Injury risk plays a part in that, especially for athletes, and is something most SIT/HIIT studies that focus on metabolic impacts don't usually measure: https://www.minervamedica.it/en/journals/sports-med-physical...

> With particularly high rates of knee and ankle sprains and strains, neuromuscular training and pre-strengthening programs, which have been previously demonstrated to be effective among young athletes, may be particularly worthwhile in prospective participants