I thought the reason Feferi couldn't do the lifey thing is because she and Jane are totally different classes. They have the same aspect, but a Witch and a Maid don't have the same abilities. Jane is Maid (made) of Life, it makes sense that she might spontaneously resurrect herself. Also, only humans have been shown to do a whatever-y thing (without being godtier first), right? Not that that necessarily means much.

Well yeah, that too. But trolls can do aspect stuff pre-god tier too, just look at TZ man, she does that shit all the time