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DD trusts have a lot more problems than just pressing bad weapon skills and having whm sub.
No gear haste, extremely low accuracy, no store tp, low base damage...

They're unusable at 99, except...

Shikaree Z is DRG/WAR/WHM or something, she has 2 subs but I can't remember if it's /war or /sam. I've seen her use JA's from another job while also casting cure magic and doing dragoon things.

I read on a wiki that adelheid is a light arts SCH but I've never seen her do anything except spam nukes whenever I've used her. She's useless.

Yoran/apururu being the only viable choices (I think...

All trusts need to be available every single day the servers are up.
100% of content should be accessible 100% of the time.