Is there any reason Riot ninja nerfed Strength of the Ages so hard?

Before, the keystone would give you the max HP bonus if you were in XP range of a siege minion when it died

Now, it only gives you the HP bonus if you are the one who kills the siege minion

This was a massive nerf that wasn't addressed, in fact, the description now is a lie; you have to be the one who kills the siege minion to get the health