The following are missing from the description in the purchase area of the portal when looking to upgrade to Tier 2:

Dedicated Teams page, so attendees can pick which team member to book
Collective meetings, where multiple hosts can meet with one or more attendees
Round robin meetings (coming Jan/Feb 2025)

Tier 2 looks per the upgrade page to only have an increase in the number of calendars. Perhaps this should be updated? Is there a reason for this?