I don't know/understand what you're talking about.
Every one of those ten unique pictograms can be easily divided into a head, central torso, left torso, right torso, legs and arms.
And those who do not represent left and right torso can be easily changed
See, there's the disconnect. I don't see those unique paperdolls as being "easily divided" in their current form. The MechCommander 'paperdolls' are, in my opinion, HORRIBLE. Blowing them up to double their size makes them marginally less bad. Sometimes it's incredibly hard to see what is happening.
On the other hand, the standardized paperdoll is pre-cut into easily visible, almost equally sized, hit boxes. Tabletop has used a standardized armor / structure diagram since its inception. MWO uses a standard paperdoll as well (which may even be where the asset that HBS is using came from). Using a standardized asset also means you don't need to customize for loadouts. Unless we don't need a custom paperdoll based on the mech loadout...in which case I'm not sure where you want to draw the line on the unique paperdolls. There are more than 10 mechs in the game (given all the variants) and they have different loadouts. In some cases, the paperdoll you use in the examples is not an accurate representation of the mech (like when you don't have a missile launcher on the Orion or King Crab or Trebuchet).
I think that introducing them would be a nice touch of flavor and great way to make them distinguishable and easily spot the desired model at a glance.
I'm not sure what you mean by 'easily spot the desired model at a glance'. In what context? In the mech lab? In combat? When would you be using the paperdoll is 'easily identify' a mech?
In the mechlab, the mechs all have filled out portraits and variant IDs on them. In combat, you get the paper doll when you are moving a specific mech/pilot. When you're targeting an enemy, you see the 3D model in addition to the paperdoll and you can tab between targets or right-click on them to see damage states. So I'm not sure when you would use the paperdoll is 'identify' a mech.