The backcourt isn't the root of their problems, it's their offensive structure, in general.
There's no rhyme or reason to their system.
They don't try to capitalize on mismatches, they don't move the ball (30th in passes per game), they don't move without the ball, they don't screen for one another with any purpose, they don't cut/dive to the rim (6.9 percentile) and they don't look to create for one another (29th in assists and 30th in shot generation).
They merely rely on talent and aggression to generate buckets.
Someone like JG has a high-level scoring skillset, but because there's minimal actions for him to get into rhythm and work to his spots, his shortcomings end up being exacerbated, turning him into more of a chucker than he already is. He's not strong enough to bully any type of defender, so off-ball actions should be a priority to free him up, but he's treated like he's extracurricular to the offense.