It seems weird to me that so many of the "falling apart" simulations described in the intro involve planets crashing into each other. I would expect direct coll

It seems weird to me that so many of the "falling apart" simulations described in the intro involve planets crashing into each other. I would expect direct collisions to be an extremely rare "failure mode", even once the system destabilizes, especially for the much smaller inner planets. Much more common, I imagine, would be near misses that fling one or both planets into the sun, out of the system, out of the orbital plane, into extreme elliptical orbits, etc.