Might not be a bad idea. CCP is sure going out of their way to make Triglavian ships first-class citizens alongside the four empires. While I personally would rather they not have done this, since they’ve already started they might as well go all the way - if you’re going to do something, do it right. In the short time they’ve been around, their ship tree has become more complete than any other non-empire faction (excluding ORE), at least with regards to subcapital ships.
The funny bit is how I didn’t even mean they should get an advantage in Abyssal. I said they should get an advantage around NPC Triglavian ships, just like you might around Caldari Navy ships if you have positive standings with the Caldari State.