I am not saying that nobody could ever find a use for it. I am saying the community at large won't regard them as useful. Sure, there are niche cases where people will find hybrid classes like that useful, but the vast majority of players would prefer to invite someone for one role, trusting that they can fulfill that one role well.

I understand that new things need to be added to move forward, but it's about doing everything in good time. Before we add a hybrid class, we need to give players a REASON to want a hybrid class, outside of simply adding variety to the healing role.