And with a parser that DRG would be able to see. With a parser would be able to see if they are pulling close to expected avg numbers for their gear, or just a 3rd of that. If one DPS is pulling 1300 DPS and the other is pulling 300 then anyone who is pulling the second with a little common sense will think "Hmmm, I should be doing more." I would happily give advice to the second DPS to help them improve. Plus they would have instant confirmation that they have improved.
If a parser was added for the PC and PS4 it would not stop you being able to report others, like now, for harrasment.
You are wasting your time asking that, it has been asked numerous times in other parser topics and all the anti-parser crowds seem to have a blind spot to that question. Only argument they have is, "because harrasment" based on anecdotal "evidence". Personally I found a more obnoxious form of harrasment over someone saying that your numbers are low is the one who puts in zero effort to the success of the party.
Been MMOing since EQ1 with parsers and without, only time get called up on numbers when I decided to switch to a DPS role. You know what? After looking at the numbers, they were right. So I made an effort and improved. I got into the habit of practicing rotations until I felt comfortable with them, then I would join party content with the confidence that I would be able to contribute adequatly to the success of the run.
There are numerous players, myself included, who are always willing to help players to self improve. There are numerous guides written by players that some insultingly call elitist/hardcore. (pro-tip it is not "casuals" that write all the extensive guides available on the internet).
Theres no I in party and that player putting out 250 DPS when the other DPS is doing 1250 is not a team player. The rest of the team has every right to replace that 250 DPS player, just like the rest of the party has every right to replace a tank who cannot hold aggro or a healer that doesnt heal. Just with a parser that 250 DPS player will know exactly why and then is able to improve until they are no longer getting kicked from parties.