I'd summarize my (different but probably related to some extent) pieces of skepticism as follows:
- yes, I think simulation theory kicks questions back up -- for one thing, it's hard to see if they stipulate a useful definition of what the alternative to simulation is -- what's "real" (this is kind of related to how I also find it smells of a God-did-it)
- I've never seen what seems to me to be even close to a good theory of consciousness, and without that, I don't see how we can meaningfully speculate about our being a simulated consciousness. Well, by meaningfully I just mean to ask if there's much force to the speculation, not if it's literally meaningless