Maybe I am reading this wrong here, but are you basing it off of the community that actually uses parsers, that you've played with (mainly in end game as that is where parsers are used the most)? Or simply off the community and how you THINK they will use parsers based on how other games communities used them. That's where I find your argument to fall short.
If you have some actual experience in FF where you've found yourself or others kicked from groups due to someone parsing saying your DPS was too low, and this happens often. Then we have something to go on here as you've clearly experienced a negative side to it. However from what I've read here, and again if I have mis-read it then correct me, but you are saying you've experienced the end game in other games or parsing in other games, and that's good enough to throw into a discussion here. in which case I would argue that's more of a discussion for the psychology/philosophy forums as to why humans act like they do, and I guess we will just never ever see eye to eye on that one because as I said, I'm taking my observations on parsing, from the people who use parsers in THIS game, in THIS community.
As I've said, from my experience the people who go overboard with the parsers are in a very small minority, especially those in PF groups. It just doesn't happen much. Those are the same people who have unrealistic ilvl requirements and who are generally players you tend to avoid in any case. One or two bad eggs don't represent the community as a whole.
As for the impact of parsers, this is what I am discussing now as I am giving you examples of how it is being used and how it is effecting the community. With regards to the implementation, there are a million and one ways for this and I get that this is probably the hardest thing to keep everyone happy. Is it a personal parser? Is it group wide? Is it PF only and disabled in DF? is it only available in end game? Should there be a top 10 leaderboard for each class per encounter so people have a reference point of what they should be parsing? Etc etc.
Personally I think they should just lift the so called 'ban' on the current parsers and let them be used and talked about freely. Literally minimal effort on SE's part. The only downside to this is PS3/4 users get shunned.
See above.