While I endorse the change, I believe it's being made to avoid arbitration being weaponized by class action plaintiffs, which can be more costly than a class action lawsuit

Eg: https://www.jdsupra.com/legalnews/mass-arbitration-aaa-looks-to-reign-in-4534306/#:~:text=In%20one%20example%2C%20Uber%20was,at%20the%20outset%20of%20cases.