I have to agree.
Thing is, Kyrie and Tatum are the only pure scorers on this team. Both of those guys are built to score - they have a versatile array of moves and counter-moves that allow them to get their shots off in almost any scenario, against almost any defender.
This is in contrast to guys like Brown and Smart who CAN score, but only really have one or two moves. Shut down Brown's driving lane and you pretty much take him out of the game. Guard Smart at the three point line and you pretty much shut him down too.
Ironically it's Rozier who is probably the third best tough shot creator / maker on this team right now and he's probably the next most clutch guy after Kyrie and Tatum.
I am ok with Smart taking the game winning shot if he has a wide open look, because he tends to make more shots then he misses in the clutch - but I'm not ok with running plays for him, because if you give him anything more complex then a simple catch-and-shoot play he's likely to overdo it and screw it up.
I'd rather not get Brown the ball in those scenarios because he seems to still be very inconsistent from outside, and seems to struggle to hit outside shots unless he's wide open. But if there is nobody else, and he's wide open, then by all means he should take the shot.
But actual plays should be run for Kyrie first, Tatum second. Third probably Rozier - at least until Morris and Hayward are back.