I think the reason we don't have that one, is because you can't turn around and go back in the opposite direction on I-84.
HOWEVER, I can see an edge case that if you were dropped off there, and then picked up around Exit 44 after following the trail (or vice versa).
Because of that, I think it should be added, unlike a 'regular' rest area that gains an exit number, but doesn't have trails that go elsewhere that you could be picked up at.
Would also need to be added into US-30's file too.