Well, you have to admit that the fact of the story occuring in various universes instead of just one is just a complication. Lem's idea seems to deal with everything just fine.
The story is, however, a bit metaphysical, mostly because it involves the assumption that physical constants react to the presence of life in the universe, which is not that obvious to me.
I'm really confident that this is an example (to certain extent) that could be described using antromorphical rule (as mentioned by Hawking): we debate why we exist, proving that the world is what it is to make us exist. But we fail to see the fact that if universe was something different that it is, we wouldn't be able to question it, because we wouldn't... exist. So the world is what it is, because if it wasn't, we wouldn't be there to think about it.
Say, that simplifies everything, doesn't it.
PS. Arthur Dent, how does it feel when a bunch of ugly Vogon scum destroyes your home?