If SE does not want players to see other players dps numbers there is a solution that would let us have an ingame parser.
The parser only show the player their own numbers, that is the basis here.
The other part could be the parser show if you are above or below what is required by your class and by how much, this would be the minimum based on numbers from SE and not some arbitrary number made by players, pretty much answering if you do your part in avoiding an enrage or not.
Since it would not parse the other players it would be harder to use it as ammunition for insulting players with a dps that is not good enough in the users eyes, it would only show if you yourself is were you need to be. This should be enough if the purpose is to improve yourself and nothing else.