For all we know, the graphics and physics engine running our universe could be a laughably mediocre imitation of what the external reality is like. That doesn'

For all we know, the graphics and physics engine running our universe could be a laughably mediocre imitation of what the external reality is like. That doesn't help the "ancestor simulation" idea, since that relies on advanced being wanting to simulate conditions encountered in their past (i.e. within the same universe). It does apply to the idea that we might be some kind of low-res game, running on a crummy hand(/tentacle)-held computer.