User blog comment:Willbachbakal/(Champion Concept) Bak Mei, the Iron Fist/@comment-8050014-20151001175628/@comment-1330314-20151001191104

His ult is literally the only instance of additional damage he has on his kit, and the rest is just harder-to-aim basic attacks. Additionally it requires a huge amount of setup, as opposed to many other ultimates that can be used on demand to deal a lot more damage and apply more CC, and max health true damage would allow him to damage tanks and squishies well without over-nuking either. The above number may in fact be a bit underpowered, considering how other melee carries can deal a lot more damage in a shorter span of time (e.g., though she has her own strengths and weaknesses).

As for item synergy, his abilities are pretty much enhanced basic attacks, so his attacks only proc on-hit effects and miss when blinded, but he also cannot use his abilities (or basic attack, therefore), and the CC component on Q and W are blocked by spell shields (R is an on-hit effect, so it doesn't get blocked).