Well, I have seen 1st hand how much of a difference ACT can make back in 3.x when I was a raider. 2 people always posted to FFXIV logs it took seeing the numbers of our worse member to explain how they were playing brd wrong.
He went from last to splitting 2-3 DPS, I mean the tanks were out DPSing him.
I don't mind seeing my number to know I can improve but I take pride in jobs. My Hubby could care less. So I don't Raid and don't care as much.
Reading memory and logs by a 3rd party program isn't detectable unless you're looking for it.
SE isn't looking for it and knows it is out there and other companies have taken action. They are giving the community the benefit of the doubt, But when you harass someone, they step in.
I wish there were a way to know how well I'm doing overall, vs just attacking a dummy or doing the raid dummies.
Even if the numbers where local or just me or when you using a dummy it could be like you did XXX DPS over a 2 mins window. So you could see if you could beat your own amount.