And yet it cannot demonstrate how or why you would expect a universe to be any different than the universe we live in now, just because you can speculate about how changing constants would effect the reality we live in doesn't mean there is or even if there can be other universes with different constants, IMHO it's more than a bit like discussing how many angels can dance on the head of a pin...
But in your speculations you are always driving the constant in a direction that equals bad, possibly changing the gravitational constant up a tiny bit would make sun like stars out of red dwarfs and allow for more habitable space around each star. In any scenario we can only judge what the effect would have on life as we know it.
We can speculate anything, maybe a tiny jiggle of constants makes a universe with lots of boron instead of carbon and there we have boron life forms sitting around thinking of how perfectly tuned their universe is...