I agree partially, but he cannot be absolved under the whole creativity argument. 'Chances' are very subjective in themselves, and many of Suarez, or Aguero's goals are not as a result of the ball being passed to them while unmarked 8 yards from goal. I expect many goals top strikers score to not even be classified as a 'chance'. Rooney himself did this against Villa last season. That is the standard.
Then, if exclusively considering 'chances', I think it is also easier to create for some strikers than others, due to their speed/movement etc.
I just think Rooney is too blunt an instrument in open play. He is a good finisher, a very good finisher even. But I don't see other strengths/qualities that will really worry defenders. He is easy to defend against. I read all sorts of 'fastest player' articles on him, but from what I see, he won't out run your average centre-half, he won't dribble them, he/we won't produce quick Barcelona-type one-two to get round them. After that, you are left with 'if you give him chances, he will take them', which is no longer enough to be a leading striker in today's PL. There were games I watched last season where I thought Rooney was akin to a central midfielder playing centre-forward. Like what I would expect from Lampard playing upfront - excellent finisher, but in open play, a centre-half will not be frightened of him. Most of Rooney's play was coming deep, laying it off, or playing his favourite Valencia-pass to the right-wing. We lack that sharp edge that has defenders turning, dropping off, scrambling etc. Yes, Rooney can finish, and will still get goals as a result, but it is a lot easier to restrict him getting all of these chances due to him lacking in other areas.
This is why Jordan Rhodes, good a finisher as he is, wouldn't get 25+ PL goals. He's easy to defend, he doesn't hurt you. Other than being in the act of scoring a goal, I would say that Rooney displays the qualities of a player who belongs in the middle third a lot more in any given game than the qualities you would expect from a top player at the very sharp end of a team. He just often uses those qualities further forward due to his role. It is long-passing, keeping possession, tracking, tackling - until he gets a good chance, thn he reminds you he is a forward. Other than that, the cutting-edge qualities are not on display. I'm not advocating him be a central midfielder either by the way, or saying he'd make a great one. I just think he looks more a midfielder than a forward, even when he's not playing there.