yeah, life is really complex. no argument there. no way our current computers could simulate it, but why are we assuming the simulation is using the same kind of computers we have? what about wetware or a computer the size of a star, or only rendering atoms when observed? it can theoretically be done with sufficient technology.

complexity isn't the issue, its more of the why than the how. personally i doubt the universe is a simulation but i have no evidence to disprove it, just belief