I agree that a fine balancing act of forces desires an explanation, but I don't get why one parameter being very different order of magnitude is such an issue.. it's like some silly aesthetic preference that all the numbers/parmeters should be the same size because that would be 'nice'

A very large ratio between two parameters and a fine-tuned balancing of forces are alternative ways of describing the same problem. The fact that you have very different intuitions depending on how the problem is framed is part of the reason these questions are so difficult and contentious.

Naturalness is the criteria by which people criticize fine-tuned theories. I agree that the comment would be better with a fuller explanation.

I think Lawrence Krauss would say the flat universe is evidence it was created from nothing, as it is exactly what you would expect if the sum of everything has to be zero.

> z = 0 = z = sqrt(x^2 + y^2 + z^2 - t^2)

I'm not sure what this is meant to signify, but surely you don't want the same `z` on both sides of the last equality?

right, typo, the left side is supposed to be a symbol for space-time interval, not z again.