Can we have relevant loot drops from Ex Primals?

[Alahra]

To be honest, Garuda was the only one with a meaningful reward because unless you could do coil it was the only way you were getting a second i90 ring.

I never felt compelled to farm Titan/Ifrit for anything other than the pony because you could just grab myth accessories and call it a day.

The accessories from Titan/Ifrit were BiS for a handful of classes. You're also forgetting the Primal Focus quest, which offered i90 weapons once per week.