How would an optional, official parser be toxic?

[NessaWyvern]

If you are following your rotation there's no need to worry. this is the internet sadly either grow a thick skin or stop playing multiplayer games.

I don't worry too much about what others say, but there are nice people who take it quite hard, and I don't want those people to get hurt and stop playing.

There's a good person on the forums that got some abuse and are now worried about their dps. A parser would give them good piece of mind, rather than doubting themselves.