The mildness or severity of symptoms is determined after the period of maximum contagiousness. What you are talking about sounds nice in theory but it doesn’t

The mildness or severity of symptoms is determined after the period of maximum contagiousness. What you are talking about sounds nice in theory but it doesn’t really add up based on how this virus works. If anything there is a pretty strong argument the other way… a more contagious version of covid will probably have a higher viral load and this probably lead to higher chance of serious disease be (like delta).