Do we know how long that person played BRD, though? We do not. Even a character search would be fruitless as it could be a 2nd account.
I've personally played ARC since the first days of 1.0 and can still see merit in every idea presented, there are no bad ideas here. Some more feasible than others but it is not right to rip into eachother over your differing opinions. The ARC players should be striving to find middle grounds and good, new ideas to present to SE - not getting stuck in bickering over the negative parts.
You hate every part of their idea? Okay that's fine, try to find a way to make their idea likable to you. That's how we create. That's how we provide constructive criticism. That's how we make changes.