For bruisers to be viable their new keystone needs to be a good anti tank option
Something like a stacking %pen buff on auto attack (like a fervor but instead of giving AD, it gives arpen).
Would be very good for bruisers, while not being completely obnoxious to play against as a squishy.
Bruisers lost fervor and 7% total pen with the runes changes and tanks gained even more damage, something has got to give.