How would an optional, official parser be toxic?

[Legion88]

No, i get it, but you are doing the classic error of assuming it is "simple." It's going to have to be hard enough to be a decent gatekeeper. That means a lot of people will struggle with it, more than you think. The danger is that it takes long enough that it makes it harder for people to get involved in the tier. Ask a ffxi vet how long it took them to beat ma'at, for example.

But if he can't beat the gatekeeper, he is not ready for the content behind, because the content is even harder as the gatekeeper himself.
So the gatekeeper would be the easiest part of the new tier, so like Faust in Alexander, but Faust only was a simple DPS check.

A gatekeeper wont let you pass if you don't understand your rotation well enough and you mess up basic mechanics and this means you're not ready for what comes behind.
And no, raiding means everyone has to contribute and not some will outbalance an inability.

[RiyahArp]

But if he can't beat the gatekeeper, he is not ready for the content behind, because the content is even harder as the gatekeeper himself.

No, i get the point. The thing though is that if you're average or less, you will take longer to get ready than you do now. Like if it takes you a month of learning parties to get past the first fight, it now takes 2 weeks of the gatekeeper and a month of learning parties. (because no fight in this game is the same, you learn everyone fresh almost.) That's a danger that needs to be addressed. It's not going to be basic, because people already do know that; you need to do a savage level rotation.