How would an optional, official parser be toxic?

[Sigma-Astra]

It is same as the WoW Addon, even though they don't support it, they also don't restrict it, therefore it is more accepted to drop "under performing" players and benching others.

If a player has shown consistently that they're under-performing over and over again, literally holding back the group from a clear or from finishing whatever piece of content that they're working on, and they also refuse or just completely ignore on improving and good advice; I'm not entirely sure how that's considered toxic to simply bench them.

It's rude to expect other players to hold your hand, carry, or coddle you when their own time is just as important as your own. I'm not sure why others expect everyone else to put in double the effort when they can't even put 25% in sometimes.

You bench football or sports players that are not performing to the team's and coach's standards (players who make a lot of fouls or mistakes), I'm not sure why we can't hold those same standards and expectations in an MMO which is not only a competitive game, but also a team effort.