Forum:Why is Advanced Ritual Art on the limited list?

As I was going through the ritual monsters, checking all of them, they all say, "This monster can only be ritual summoned with the Ritual Spell, '*corresponding ritual spell*' or that it must be a 'Gishki' Ritual spell.

Except one.

Relinquished.

As Advanced Ritual Art is a Ritual Spell, that means Advanced Ritual Art and Contract with the Abyss can only summon Relinquished, if this effect is read correctly. Also, that makes Earth Chant a completely useless card, as Relinquished is a Dark monster and Earth Chant's effect states,. I know the people I have asked previous say they just summon the Ritual Monsters with Advanced Ritual Art regardless, but this would technically be an illegal maneuver, wouldn't it?

So, my question is:

1. Yes, Relinquished is a good card, but as it's the only Ritual monster that can be summoned with Advanced Ritual Art

2. If we are indeed following the rules as stated on the card text of the Ritual Monsters that state the only Ritual Spell allowed for Ritual Monsters is its proper one

3. Then why is Advanced Ritual Art, which can only summon Relinquished and only by sending an exactly one-star normal monster from the deck to the graveyard as per the cost, listed under limited?

4. If you don't believe me, check these pages please. I am citing this own wiki to prove my point with these following pages.

http://yugioh.wikia.com/wiki/List_of_Ritual_Monsters http://yugioh.wikia.com/wiki/List_of_Ritual_Spell_Cards http://yugioh.wikia.com/wiki/Advanced_Ritual_Art http://yugioh.wikia.com/wiki/Contract_with_the_Abyss http://yugioh.wikia.com/wiki/Earth_Chant

To be noted, none of the Ritual Monsters or Spells specifically state say that Advanced Ritual Art, Earth Chant, or Contract with the Abyss that these can be substituted out for any Ritual Spell, only that they can be used to summon a Ritual Monster, in summary, specifically meaning they are replacements for the rather common Ritual spells, but it is the Ritual Monsters that block the application of these cards.