[quotemstr]

Planetary collisions happen all the time. All of Mercury, Venus, Earth, and Mars in our solar system had them. We can see their signatures in other solar systems too: see https://en.wikipedia.org/wiki/List_of_extrasolar_planetary_c...

Whatever the great filter is, it's not planetary-scale collisions during the accretion phase of solar system formation.

[mr_toad]

A couple of dozen collisions out of 6000+ known exoplanets. Not exactly common, but not freakishly rare either.

[quotemstr]

Those are just the ones we caught in the act. That we can see 6,000+ means that there are many more we don't see.