It's because a lot of people in the community understand that not everyone who plays has the time to understand an optimal rotation. When you work 9 hours a day doing something horrible to yourself like customer service, the last thing you wanna worry about is pushing out maximum dps. But besides this, trust me when I say that a newbie is not going to learn how to be "good" at the game when the community alienates them for being "bad." They'll just not want to play the game and quit. A lot of people get this because they used to be in that situation so they try to give them the benefit of the doubt and give them a chance to learn. Now, obviously griefing is an issue, and if someone isn't even trying to improve then they deserve to get booted. But at the same time people shouldn't be called out for something so trivial as a suboptimal rotation, costing you minutes of the run at most. It's okay for people to be bad at the game, because that's how you start no matter where you come from. And you cannot in a million years tell me you weren't bad at the game, or bad at MMOs at some point. Nobody picks up a game they've never touched before and knows immediately what they are doing. It's a learning process and it's our job as a community to give people the opportunity to learn and improve so we can all enjoy content together.