Adding to what has been said above me, the problem is, the more accesible such tools are to the average people, the more some are gonna expect from you to perform on a specific level and if you're behind other dps or what it is expected then you'll start being seen as "bad" and "undesirable" just like in wow, i kinda get that checking your own performance to see how good you're doing isn't something that you do on a malicious way, but it is definitely not gonna be the same for others, and if such tool is available for everyone, then yeah some are gonna demand that you share with them even if it were only visible by you.