BLM was incredibly niche prior to the buffs and stupid easy to kill. Post buffs outside of the LB its still stupid easy to kill them. BLM desperately needed buffs, so no it wasn't a biased update. The problem is the pure solo queue with no chat features means most people just do their own thing and don't coordinate. Prior to the patch most people just ignored BLM because they were not a threat. Post patch people still ignore the free casting BLM, but now its a threat so they just complain instead. Literally anyone with a brain can realize all they need to do is dive the BLM and they will never be a threat.