As much as I prefer to avoid such topics my take on parsers is as follows. I'm not outright against them but if they are used outside of a premade group with a proper set of rules(i.e. PF, static) to harras others instead of helping/stating the obvious(aka this isn't happening - but then you don't need a parser to see that really) then that would be qualified as harrasment.
I've been "pen and papered" countless times. I was never harrased about it though I did have a discussion with someone that did parse me as to why my damage was on average 15% lower than the melee and casters but it was all civil and after the fights. I had people give me numbers at times as well but for the most part I rely on the rather inaccurate though still not that bad way of enmity meters - there's a reason they are bars really - makes comparison easier. I also discuss stuff with others that I know are good with the job.
I mean if you have the following in the bar form:
5 [|------]
3 [---|---]
4 [-|-----]
2 [-----|-]
A [------|]
It's pretty obvious that #5 and #4 are outputting crap dps(outside of quelling strikes, elusive jump - but tbh a good dps will claw back up from either - atleast I do after a quelling strikes opener and tend to be either #3 or #2 often depending on mechanics and jobs) - the ratios matters as much in there to give you relative value towards the other dps.
If you on the other hand have something like:
3 [----|--]
5 [---|---]
4 [----|--]
2 [-----|-]
A [------|]
You know that all are outputting reliable DPS and no big worry there.
Of course this all works great for single target, multitarget it breaks down.
If an official parser would be added would I use it? Most of the time: NO. I don't need to know my dps so much and I prefer to enjoy the game itself and the encounters instead of looking at numbers so much - and I kinda doubt we would get an ingame parser that would allow much in terms of historical/fight analysis then it would just be a number.
And I agree information is a good thing. But to much of it is also bad - especially if it lacks context.