Really...eh? The field is never, never a level playing field between one with only four senses compared to one with five senses. All of life's possibilities?!? I don't think so and I know for a fact it is not so. Been there and done that. With my CI, my world has opened up in ways that is unbelievable but for all that...I know my limitations and I'm comfortable with what and who I am. I will not claim that the playing field is level and that I can experience "all of life's possibilities". Believe me, I push the envelop pretty far...
It is one thing to accept one's lot in life and be content. If one does that, it is a fine thing indeed. But that doesn't imply a level playing field simply based on such thinking. One who thinks that is deluding one's self big time.
It is much better to realize one's limitations and go from that point. It is amazing what one can accomplish that way. It is one thing to state that hearing "per se" isn't necessary but another to claim that the playing field is level while lacking some or all hearing.