I think all undocumented changes are bad, only for the fact they are undocumented and it creates player/dev distrust.
This is so cringe, instead of tuning overall dmg of runes which are broken OP compared to non-rune spells - they add % mitigation in BGs like it's retail xDD. Not to mention damage is at it's lowest right now, imagine what will be @ lvl 60 lmao