How would an optional, official parser be toxic?

[SilverObi]

I don't think there's any way to make it optional. People would be pressured into using it by the community.

That just doesn't cut it as an excuse anymore. The community pressures meta into content that doesn't need it but that doesn't stop people from completing said content. There is a wide pool of people to play with and if a group or two won't let you in without showing your personal parses, then find other players with less stringent criteria to join. Having the ability to easily check your dps is something most players would have an idle curiosity in and making those numbers accessible is fine.