I'm a professional software developer. Speaking from first hand experience, tutorials won't reach the players you want to reach. Why? They don't read them. They want to click them away as fast as possible to get back to whatever they wanted to do. Ever tried making a Delete function that won't result in accidental deletion? It's impossible. No matter how many checks, confirmations, and warnings you put in, people will still do it. At some point it becomes counter productive because once you have too many, they stop reading them entirely and just click "Yes" to everything blindly. People also do this with browser security prompts, which is part of why security is so terrible and also why browsers display far fewer prompts than they used to. (True story: I had someone delete a record, then call support. They asked where the record had gone and why it was missing. I checked the logs, walked up to their desk, and showed them the delete button they pressed, then the giant red warning that it'd delete the record they also pressed. Clearly they didn't read either of these things because they were surprised that a delete button existed, and it was very hard for me to resist asking if they were in fact capable of reading.)
It's not even about "laziness", per se. At the end of the day, people want to clear content. For your core gamer, they also want to optimize, try to find tricks, and such. For another segment of the market, they don't. They want to get their goal done, and that's it. If they can do that, as far as they're concerned, nothing is wrong. If they're being carried? So what? The game doesn't tell them that, and there's no real disincentive to do it in roulette because the only problem aside from a kick is failure, and failure is RARE in roulettes.
It can be a real culture shock when people hit Ex/Savage and suddenly start being told they're doing bad DPS when nothing has ever told them that before and it hasn't mattered at all. A tutorial won't fix that. If you want to fix that, you need to surface that information a lot earlier. IMO you also need to up the difficulty of levelling and expert content so that poor play is more punishing, because if you can stand in absolutely everything and be carried by the healer, what's the harm?