I look forward to Riot's justification of these xin buffs in the patch notes.

"Well we found that xin was really underpowered in the current meta so we're gonna give him a 3 hit passive which he needed for clarity and also give him AD scaling on his heal and also give him free crits and also give him the ability to solo baron at 20 minutes and also give him the ability to solo towers without minions. This will enhance gameplay"