Jrue was severely limited offensively. He was capable of your 38-point game here and there but he would go 4-of-18 all the time. This dynamic worked when Middleton was healthy because he was someone who could generate his own offense. Once Middleton was cooked and never there (see 2022 East Semi), it was basically what you have today.
It's a horse a piece on different ends of the floor. Giannis and Dame don't work because both need the ball in their hands; Giannis and Jrue don't work because neither one is a reliable jump shooter. I'm aware Giannis added that a bit to his game this year, but I mean once he's walled off and draws too much defense, Jrue isn't the guy to take any heat off, at least not consistently enough. Of all the things to blame the Bucks for, this isn't one of them IMO. It was obvious they needed more offensive star power. They swung for the fence, but they missed.
He has a dream setup in Boston where he doesn't need to be relied upon to score pretty much at all, but is still highly effective.