thats exactly why cd-reduction on melee-AAsdoesn't work.
If Taric is allowed to get his rotation done, he can nearly permastun while inflicting massive damage and beeing kinda immortal if he has max cdr, but since he needs to get into melee range while only having his dazzle as sort off gapcloser is incredible hard, and if he can't follow it up with his rotation he will have a huge cd, beeing usless for a quite long time.
Similar with xin.
If he gets you and lands all 3 Qs, he not only deals high damage and the knockup, he also reduces his cds, allowing him to keep his W perma up and use his charge nealry the moment his knockup ends, makeing it really hard to escape.
However, if you manage to get out of range after his E befor he can land the Qs, you not only deny alot damage and the cc, but he will also be left with nearly twice the cd on his gapcloser, makeing him damn vulnerable for kiteing.
Those cd-refresh on melee hit mechancs just snowball hard in both directions, makeing the best case even better and the worst case even worse....