Apparently several people liked my suggestion and asked that I create a new topic about it. OK.
Here's what I wrote:
I've always thought that turret mode was a fantastic element of the C-Class mechs and actually defined their body style - the reason they have those huge shoulder shields is so they can go into turret mode. I believe that, since turret mode does not provide a benefit to the player (just an alternate stance that sacrifices mobility and aiming... and is highly vulnerable to attacks from behind) why does it have to be the "Special Ability"? Why not make turret mode activate using a different button, let all the C-Class mechs return to having turret mode available and give them all a special ability?
Seriously, what difference would it make if the Grenadier could also still use turret? Would it matter all that much if the Rocketeer had the special ability to fly without fuel consumption or lock on to multiple enemies for a few seconds... AND still had turret mode? Maybe the Vanguard could have a special that allowed it to go into turret mode use it's turret shields/wings to shove and do melee damage for several seconds to help it clear out an objective...
Essentially what I'm saying is that I've never found turret mode to provide any real benefit, but find no justification for taking it away.