How would an optional, official parser be toxic?

[Arrius]

A person who doesnt bother to improve his gameplay will not magically become better for having a parser, similar on how people dont play tanks despite all the bonus they keep putting for playing as one including faster queues, exlusive mounts, role bonus etc

But that person is easier to spot with that and knows that the others will see the bad performance more clearly.
And thus easier subject to Vote Dismissal.