Not necessarily, time dilation & celestial opposition are just magic enhancements from the root of life so in other terms, its not affecting the monster swinging speed *maybe cycles but thats something players already are aware of as they skip phases already* nor does it affect other players speed by much (compared to rewinding the whole reality of the battle) & if we want to talk about arrow card as an example,sure it does affect speed but dark knight can blood weapon to do that and ninja with huton,plus ninja can maintain that speed if done properly, aka: infinite buff & time control from the way you view this?
If you whisper to someone or yell at someone, the voice intonation is different obviously & that's just a matter of the energy you put at it,also if you yell,the echoing should be reaching further unless I am mistaken.
Rewind would be a second chance inside a battle & i think that this would help a lot of players while being cool at the same time.