As much as I'd like for this to be replaced by something cooler (ex: R8 Brutals/Blice, better chances of legendary rings, chances for legendary mount), this likely isn't getting changed.
Remember that, back in Mod10, Relic Armor was exclusive to FBI. It was proof that you didn't need the Relic Armor to beat FBI...
The addition of Relic Armor to the Seals vendor was a way to replace the outdated Elven Armor and give people who needed catching up a way to get good armor without needing to beat FBI.
I wasn't around in Mod 10, started playing at Mod 11, so I'm speaking as a new player. Running a time consuming dungeon in order to get something that I could have just bought if I actually wanted it is pretty poor.
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Remember that, back in Mod10, Relic Armor was exclusive to FBI. It was proof that you didn't need the Relic Armor to beat FBI...
The addition of Relic Armor to the Seals vendor was a way to replace the outdated Elven Armor and give people who needed catching up a way to get good armor without needing to beat FBI.