Board Thread:General Discussion/@comment-29045088-20160714104605/@comment-17964257-20180809100345

I am not entirely sure why you think I am not calm, based on my written language, which didn't even feature any words to indicate I am not calm.

And again, "a lot can happen in 20 years" is an invalid argument, when we are already talking about the circumstances 20 years in the future. In Accel World, it is explicitly stated that you need to have, at the very least, used the chip shortly after birth. Unless Reki does an asspull, this is a biological bottleneck, that literally prevents you from using the system. It's not a limit put in via a code on a software level. Your brain can't simply can't cope with the Acceleration process, if you are not using it since birth.

Also, the only thing Kirito achieved in-universe, that was thought to be impossible, is overcoming the system in VR, which was, not "impossible" per-se, but rather an unknown phenomenon. Brain Burst usage requirements, are known.