Except for the fact that the first week of the set being out we had Sam Stoddard admit they had missed the interaction.
CopyCat is getting a ban, because part of the current mediocre standard turnout can be blamed on Wizards not willing to ban cards when they really should. No one wanted 2+months of Bant CoCo mirrors, or the 2 months of Rally mirrors.
The issues are that Standard has been pushing creatures/vehicles so hard that answers can't even come close to matching up, and until answers do you've got a shitty "Who draws their bomb first" playstyle, because evidently there's little incentive to interact. CopyCat can kill over 2 turns starting on Turn 3/4 and can do it in one starting turn 6, with backup dispel Mana if you try to kill the Saheeli in response. GB Counters has you dead on Turn 5, because Winding Constrictor is dumb. Mardu Vehicles has a 4/4 Flying Vigilance 2 Drop, because Gideon effectively makes it free to crew.
What's the answers look like? Oh right, 5 Mana board wipe that do nothing against CopyCat, hurt GB, and act as a temporary setback for Mardu, Countermagic(which is "good" Saheeli but awful against GB while being alright against Mardu) or whatever Red removal you want (Quickly loses function against GB, works alright against Mardu, Saheeli just counters it)