The point of the op's post was that it snowballs and unbalances things. If you're good enough to build high/fever in the first place, why do you need a dmg assist buff to make you stronger. It makes it harder for the other team to make a comeback when the winners are running around with highs, you aren't on equal footing now. Rewards for being good are fine, it feels good to earn a high, idk if damage boost is the right way to go with it though.