Because a queue does that.
A queue:
- determines what agents handle a ticket
- has permissions
- has escalations
- has autoresponses
- has email addresses
- has subqueues
Types, services, priorities, SLAs, states are not these things.
Sure, you can use ACLs to filter some things based upon other things, but the real question isn't whether something *else* can be like a queue, but why queues can't work for the purpose you want.
(/end rant)
BTW, if you have a different opinion, tell me.

If I'm wrong it'll help me not to repeat bad info.

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