He mentioned that in a perfect world they'll want 5 duelists, 5 healers, Etc. 5 of every role.
They will then watch team comps and if comps are 5 of the same role then they will work hard to fix it.
It's important to call out here that "healing" is not a role - "healing" is just an output (something that characters can do) in Valorant. Our roles are Duelist, Initiator, Controller, and Sentinel, which are all focused on how players initiate engagements and fight over territory. "Healer" is not a role, but we will probably release agents in the future that can heal allies - it's not great that Sage is the only one that can do this right now. That is not the same as to say we want an entire "healer" class - we want agents who heal to do so because it allows them to perform their role, NOT have healing define their role. If that makes sense.