Bogey isn't shooting at the same percentage as Barnes... One is at 38.5% on 6.5 attempt and one is 40.4% on 5 attempts, almost a 2% gap. And Barnes's now been shooting 38% or above from deep for 4 straight seasons and 6 times across his 10 year career, so it's not like this is some kind of outlying performance from him.
And like I said, ones being overused and ones being underused. Getting your shot isn't necessarily an indicator for being a good shooter. It has everything to do with your teammates and coaches.
We happen to have one of the leagues best screen setters in Rudy and top 10 PG in Conley so of course shooters will find it easier to get open looks. Especially for a guy who's been struggling with the ball in his hand all season like Bogey, he's already getting more shots than he normally would had he played on a team like the Kings where they just let Fox ball hogging with no regards to teammates whatsoever.
No reason Barnes can't get 6-7 shots from deep per game if we can get him on the Jazz. And keep in mind even without teammates creating for him, he can also create on his own more consistently without turning the ball over.