Kinda on the fence about this. For a game like FFXIV, it makes a lot more sense, as the story is directly tied to the level/gear/experience of the player. Players who don't know how to play the game are not gonna have a particularly easy time w/ it there, and you straight up cannot play any new content unless you are at the appropriate strength/level. Warframe has no such issue (which I don't like-- a quest like New War shouldn't have level 10 enemies, as veterans won't feel any sense of threat), so really they're just being given a bunch of planet and quest-related unlocks (mostly frames and weapons) it seems. It skips a lot, but doesn't seem nearly as valuable to me.
That being said, I'm still for it. Options don't hurt, but I think it's necessary to consider exactly what content this means new players will be given immediate access to. Also, the difference in experiences of each quest for players of different hour counts should be looked at again as well.