The funny thing about this is.... this isn't new and hasn't really changed much since ARR was launched. It's the same old problem that was coming up in threads just like this 2 years ago, but it's just new players finding out and complaining about something the community already knows, has accepted that this is just how it is and moved on. DF queues for DPS have always been and will likely always be much longer than tank or healer queues based simply on the number of DPS jobs to tank/healer jobs and the overall number of people playing those jobs.