Pistols are okay in confined spaces; they're easier to maneuver around corners. But outdoors people who can successfully run a pistol as a primary are few and far between (typically snipers moving around with a Mk23 or the like).
As for akimbo pistols, this isn't the movies: whatever mad skills you think you have, you don't. Most people have a hard time using just a single pistol properly. In the real world, mastering the use of a pistol -- quickly and accurately putting sights on target, accurately putting shots on target, efficient reload, etc -- beats out akimbo movie bullshit any day.
__________________
|