Couldn't it be the case that a lot of the scientists investigating this hypothesis are very philosophically-minded and are aware of all of these things and know it's probably non-falsifiable and futile? Even if you believe that, it still can't hurt to try. Science is all about testing things. If there are some things we can check, why not check them, just in case? And even if we don't get any closer to knowing whether or not we're in a simulation (which we probably won't), we could still learn other things in the process.