Ok, first of all, you don't need to be condescending, which is an unfortunate trend when having any discussion about role playing.
Any condescension was directed entirely at your implication that people just weren't pretending hard enough.
You may think my idea of explaining regenerative health is 'silly and contrived', but really, what is so different about adding a piece of fictional history about my character when you can search these forums and find pages and pages of detailed backstory for hundreds of characters by players? Are you saying all those people don't really know how to roleplay either? We're all apparently amateurs that just don't understand how to really play an RPG game.
Back stories serve the purpose of helping a player formulate the personality and preferences of a character. They might establish which weapon a character will use, what factions they join, which the avoid, which the attack on sight, etc. In and of themselves, they are only valuable if the game actually recognizes a back story. For instance, if you had the option to choose "enemies" or "rivals" for your character at creation which would either unlock certain quests or random encounters, then the back story would matter within that context.
As it is, it's pure fluff. The game doesn't give a [censored] what happened to your character in the past. He could have single handedly blown up the universe and then reconstructed it by hand, but it doesn't matter. The game will not recognize any of that. Without the game recognizing and responding to these decisions and choices, you have the bare minimum of what's required for an RPG (if even that).
"For a game to be effective in offering rp potential, it needs to respond to those decisions a player makes". I'm sorry but I don't agree. For a game to have RP potential, it needs to provide rules and guidelines sufficient to create your RP. The PLAYER then responds to the limitations by...roleplaying. It's not the game that provides a satisfactory RP experience, but the knowledge and decisions provided by a person with a vibrant, original idea.
The game is not the fantasy. The RP is. All the game does is provide a canvas, one with rules and guidelines but empty without the player's decisions and playstyle.
I didn't say you
couldn't role play, I said it didn't offer an effective system that engenders role playing. You are forced to fight against the limitations of the system instead of work with them. That's not conducive to good role playing and is a weakness any way you turn it. So, this comes down again to you thinking that pretending stuff is preferable to the game recognizing and encouraging your role playing.