Well, for starters we only think it's so "precise" because that's the model we've constructed to understand the laws of physics. But once we fully understand what's happening at the quantum level, we might scrap the Standard Model altogether, and discard it as useless (for whatever we plan to make next with the new found knowledge).
Plus, it may be this "precise" in the same way Earth has "exactly" the things it needed to create life, and ultimately us, humans. That's to say it wasn't precise or exact at all. It was just a potential combination of stuff, out of trillions and trillions of other combinations, which may or may not have resulted with the same things.
So who's to say our universe isn't just one of the potentially trillions of trillions of other universes out there, and that other universes exist with life-forms that we can't even imagine (inter-dimensional/inter-universal beings, etc). We just turned out the way we did because that's what we "got" at the roll of dice (sort of speak).
Plus, it may be this "precise" in the same way Earth has "exactly" the things it needed to create life, and ultimately us, humans. That's to say it wasn't precise or exact at all. It was just a potential combination of stuff, out of trillions and trillions of other combinations, which may or may not have resulted with the same things.
So who's to say our universe isn't just one of the potentially trillions of trillions of other universes out there, and that other universes exist with life-forms that we can't even imagine (inter-dimensional/inter-universal beings, etc). We just turned out the way we did because that's what we "got" at the roll of dice (sort of speak).