I've never had a problem with people using or not using parsers. It all finitely depends on the user whether the tool itself is used for learning or for personal enjoyment through harassing others with it. And if someone is harassing you non-constructively because they can see your numbers? Well, there's a report feature for that. But, people also need to stop, and I mean stop, jumping up in arms anytime someone offers some constructive criticism regarding their performance in-game. There's nothing factually wrong nor is it a personal attack on you when someone offers to tell you that you have the wrong tank stance on or if you're doing a part of your rotation out of order.

Personally, I enjoy using fflogs as a tool to improve myself, especially since I started doing Savage content. It makes me feel really good when my numbers are even a smidgen higher than the last time and if they're lower? Oh well, off day or I messed up, stuff happens.