Contrary to being the current target of fan hate, the kid has not regressed at all.
Burks has made solid yoy improvements while being more of a focal point, something that tends to have the reverse effect on box score stats. His A:T is up 17%, TOV and AST% up sharply, and he's getting to the line 15% more. The only area he seems to have declined in is 3 point shooting percentages. However, it seems like many of his shots are late shot situations where he has to create off the bounce. That's a poor shot but one he has to take. Not his fault.
Outside of stats, he's clearly made improvements playing within the offense both on and off ball. There were times last season that he looked lost, and having him as a playmaker was a disaster. He's been a much better facilitator in spite of having a weaker surrounding cast.