No you don't, however the point of that person's post is that, people don't mention they even have a parser, they will tell them or eventually let them know then give them advice. If you look at his perspective, hes saying if people did have a parser, they would be aware of this by themselves. Many people straight out refuse they need to improve, look at the screenshot up there and the reply the person gets. Like I said, you don't need a parser to see if someone do wrong no, but then again, it's the basic stuff we talk about here, not the things you actually need to do. You can for example see a BLM cast fire 4 for a long time then suddenly drop his eniochian and she/he will cast fire 1 instead. This is basic, but it's the long term run where it gets more ''difficult'' and where people straight out refuse to actually understand what they are doing wrong. But then again, people here says you need to be using a parser to be an asshole, while my post proves otherwise

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So.
You don't need to be a parser to be an asshole. I just think the issue is people are in denial or straight up doesn't give a damn what others say and it's all about the rest giving effort and as long that happens, that 1 person doesn't care. What if everyone in the group had same mindset as the lazy/denial player? You wont even see a clear. Be greatful for people who actually does good or tries really hard, without them you wouldn't even be that far. This is a message to people in general not you btw.