being the lord of change doesn't directly implies that such change is going to be good... or wise

Tzeentch, the poor deluded fool.

Boy, Girl, or Other; it matters not to Slaanesh. You will be lewded in the worse way possible.

A very angry, chain-smoking, forced-to-adopt-an-avatar-of-annoyance Word Bearer once told Slaanesh to go f^%k itself with a chainsword. That delighted Slaanesh.