It's a bit naive... But the best argument for me that we are living in a simulation is that we went from Pong to pretty good VR (good enough that if you have a beer or two before using you can forget its VR for some period of time) in 50 years. In another 50 years it seems fair to assume that we will be able to create VR that fully immersive and impossible to distinguish from real life.

Even with no other arguments about the benefits of WHY one would want to live in a fully simulated world... It seems probable to me that we are based on the idea that it could be possible.