It wasn’t like stormcrown did a crazy amount of damage to enemy heroes and structures. They should have compensated the lesser base damage to a higher percentage of damage done to enemy heroes and structures while providing less clear speed which was the main nerf needed.
60-160 down to 40-130
but instead of damage to hereos and structures down, they should have made it go up to compensate.
25% to 30/35%(latter highly unlikely but you get my point)