The reason is if you time the rewind ability correctly you can get all your health back. It just requires more thoughtfulness when playing vs having an unkillable Altea spamming her Utl every 30 seconds or so. I use the second Utl a bit more for the unlimited bullets.
Glad to see there are pro players like you playing on phone/tablet, personally i dont like “top players” who plays on PC…..for me thats cheating on aiming. Keep the good work💪