I've played Daggerfall all the way through, perks are just the most recent incarnation of that system. Like I said above <_< Oblivion just took the Advantages system in another direction. I didn't mention disadvantages because I wasn't talking about Disadvantages, I was talking about advantages. The basic concept of advantages is what created the perks system.
That is pretty much saying that in the Elder Scroll perspective, Birthsigns and "Oblivion" perk are the "same"; for a Fallout example, Traits and Perk are the same as well.
Remember that Birthsign is a "bastardized" version of Advantages and Disadvantages and Oblivion have shown to have both system.
Also remember that inherent does not automatically mean "gain" or "learn". That is what make Birthsigns/Advantages and Disadvantages/Trait different from Perks.