Why should I have an accessibility advocate?
It's helpful to have someone to be the point of contact for accessibility questions and concerns.
Accessibility advocates, boiled down, serve as a point of contact for any accessibility issues. It's helpful to have someone in charge when a user ticket gets sent to avoid responsibility confusion. By assigning someone, your organization will know who should answer concerns.
However, if your organization already has a internal workflow to address accessibility barriers and would prefer using a team inbox, that is fine too! However, this inbox must be monitored, otherwise any accessibility feedback might get lost.