Irving isn't a franchise level player (A+ if you are grading). He also isn't an A level player and might not even be an A- level player given his inconsistency. And sure all players have bad shooting games, but when you don't pass well, don't rebound well, don't get to the line, turn the ball over, and are at best a bad defender, you aren't what this board claims.
It's this paragraph, combined with your other thoughts, that people disagree with.
He does pass well. As I pointed out earlier, only a few players average as many points and assists as Irving per 36.
He doesn't need to rebound well.
He gets to the line a reasonable amount. If he was a worse shooter, that would be a bigger issue, but his scoring efficiency is still pretty high level. For his career, he has a similar free throw rate as Curry.
He doesn't turn the ball over that much. In fact, his turnover rate is one of the best in the league for a player of his usage and assist numbers.
He is not "at best" a bad defender. That's a false narrative. At best he is an above average defender that has the ability to make timely defensive plays. At worst, he is a bad defender.
He is an A- player that has played like an superstar in key moments in the finals. Inconsistency is a slight concern, but not as much as you are making it. These next couple of years should be the years when he comes into his own as the primary ball-handler. If he is the same player at the end of those years, I would be slightly disappointed, but he'd still be worth the max and could still lead a team to the finals.
If you don't like his personality, that's fine. If you are concerned about injuries, that's understandable. But the way you slice up his game and color the hue to make it as negative as possible is what is questionable.