Current global snapshot: Tier S+, 50.64% win rate, 0.74% pick rate, 4.52% ban rate.
Liang is valuable because he removes options. His suppression and control make mobile assassins and greedy carries play slower than they want to. He is not picked to top the damage chart every game. He is picked to make one key enemy unable to play the fight. If your team understands that, Liang turns chaotic ranked games into simple target calls.