Button mapping is something that I believe [u]all[/u] games should have regardless of platform or genre, I can guarantee you that at some point in your life there has been a point in a game when you've thought "I wish I could use this button as [u] [/u] but there was no way to do so. I believe that this is a problem within the video game industry that needs to be addressed, there is a double standard in the industry that PC games need mapping (they do btw not trying to say otherwise) while it seems that they go out of their way to not include it in console games. I do not claim to understand their reasoning but I do think that whatever reasons they do have are negligible when compared with the reasons to the contrary.
This hurts gamers. That may seem dramatic but the main point of video games is to give you an experience, and the ability to have personalized and fluid controls that work for you can do nothing except heighten the experience. Also however small of a population it is, this hurts disabled gamers the most. For those that have lost fingers or even an entire arm, most default control schemes are not practical (yes there are many who still play, but that doesn't mean that it shouldn't be easier). Why should we make it harder for people to play games when they already have a disadvantage? Not saying they can't be good at games, (hell, most of them are probably better than me) I'm saying that it definitely doesn't make it easier for them.
These are my thoughts on the matter, please share your opinions (if you want to, I won't lose sleep over it).
DISCLAIMER - The above statement does not apply to PC gamers, please do not feel obligated to mention that PC has had this feature for years (we know, all I want is equality), it would add nothing to the conversation except start a flame war. Also there are of course games that are exceptions to the rule, either games that have mapping and games that [u]need[/u] to have certain controls whether it's the game's gimmick or it enhances the experience (Brothers: A Tale of Two Sons is a perfect example of it done right).
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It's absolutely necessary. the only excuse i can see if that it would confuse people in tutorials or games that say "Press X to jump" every time you find a ledge.