Dont forget, it states that the +4 is after you know your roll. So you can say "I missed with a daily on a 9! Well, lets that in to a hit shall we".They get no extra stat bonus, but they still get +1 and, arguably, an incredibly strong encounter racial. +4 to an attack or save you failed is pretty good and reason enough for me to still play a human. Especially since it means I will RARELY miss with a daily unless it's my second one in the encounter.
Adding a +4 *after* the fact. This means you add the bonus once you have a pretty good idea that its going to help, rather than having to speculate that you might need it. That is sensationally good.
Mind you, isnt that just a re-hash of "memory of a thousand lifetimes", but less variable?