No, PGs in particular are different.
Any player, if they start munching shots, can begin to have a deleterious effect on his teammates shooting abilities, because they get out of rhythm, never know when a shot is coming, can't build any feel. Call it Iverson effect. But when a POINT guard stats gunning up shots, the effect is much more pernicious. The point guard gets the honor of handling the ball first on nearly every possession. If he uses that honor for selfish purposes, then its not even a question of the offense going away from certain guys and resulting in cold streaks, its a question of guys not even getting to touch the ball. Not even getting a chance to see if they have a good shot or not. if Demarcus Cousins takes 50 shots in a game, at the very least 2 players have touched the ball on every one of those possessions (well, given his ballhandling skills, maybe on 45 of the 50). If Isaiah, or any other PG takes 50 shots, there doesn't have to have been anyone else touching the ball/getting an opportunity. That's also why "shots" are not the problem so much as shots off your own dribble, shots without passes, pullups on the break with nobody underneath etc. If Peja Stojakovic takes 30 shots in a game, Peja is not to blame. He exists at the end of the tunnel, the finish of the play. He gets 30 shots its because of your plan, not his, and lots of people are involved in him getting all those shots. When a PG does it? Unless he's a dribble it up, hand it off, and go spot up PG, then he's calling his own number, and other guys can easily get frozen out.
All of that is before we get to the tendency for IT and most quick PG scorers to want to accelerate and scramble the game for heir own purposes, resulting in easier looks for themselves, but not necessarily playing to the strengths of the team or resulting in wins.