It really doesn't sound like you've read up on the D3 system much. I thought your way until I did further research into the game's item and game randomization. The game rewards playing the entire game (much like you do already with multiple characters). There's no drop increases in Boss drops. You're better off playing through the game in full than warping back and resetting a boss. Play the game, work your way through. That, and Inferno is basically the testing ground for builds and items. You just don't need to restart a new character. Instead change your current character around and run it through the gauntlet of inferno. Beats getting power leveled artificially just to move a couple points around. Progress is made through playing it normally, and there's a lot of game to play.

All of the customization that existed in immutable skills now involves stat manipulation and armor customization (expensive and time consuming though) in combination to figuring out the optimal skill set and runes for you character. Inferno is always a higher level than you, the whole playthrough. You're having to customize your character for survival, and praying for decent drops while it happens. This sounds excellent to me. Immutable stats and choices that force character resets are just not a great thing. Especially if they patch things around and destroy a character's usability. This sort of flexibility is passed onto the designers as well.