It seems to me that Ramen Profitable is a narrow enough window that a given startup isn't likely to stay there for long. Either it will continue on to become Unqualified Profitable, or it will hover there for a few months (which isn't that long in the grand scheme of things) before falling back to unprofitable.

Extending the runway metaphor just a bit too far, when an airplane is within about 1 wingspan of the ground, it gets benefits in lift and drag from ground effect, but almost nobody flies there for very long because you're still really close to the ground.