They are different currencies, used to reward/promote different kinds of content. For example, you get Allied Seals from Hunts, and GC Seals for Fates or GC Leves. The devs want players to actively participate in different kinds of content, rather than just run Fate-grinding parties all day and convert GC Seals to Allied Seals. I realize that a steep conversion rate can help offset this, but it's not the same. Besides, as you said, you have no problem attaining a ridiculous amount of GC Seals, so whatever they set the rates at there will be people who will just grind one type of content to get everything.
If the devs really want to allow you to purchase certain items with other currencies, then obviously they can just make those things available for the respective merchants.


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