Looking back, Release Xin was healthy.
Sure, he was strong but he wasn't anything a semi-competent team couldn't deal with. He was extremely weak to CC and he had escape tools.
I think if anything, Riot should learn from Release Xin and not become such reactionaries when it comes to powerful champions being released. All the babies at the time crying on the forums were just upset that they couldn't deal with a squishy glass cannon melee carry. It's not like he possessed great CC himself, with a single-target knockup every couple of seconds and a AoE knockback.
Release Xin literally did nothing wrong.