Let us not get hung up with the MWO !=BATTLETECH !=TT thing. This way leads to madness.
I tossed out the SHD comparison as a simple illustration of 4 55 ton mechs that we do have and how they could all be different... but they aren't. A segue into a deeper convo about Quirks.
Well, yes and no. The hardpoint locations do add flavor and uniqueness to the mech. The WLV has the Ballistic hardpoints in the arm, giving it a natural +1 ACC bonus while the SHD has it in the torso, which means it's better protected by armor. Similarly, the WLV has the highest top speed of the 55 tonners (150 vs 80 for the rest). The SHD is the stand-out for melee (though all 55-tonners have the same DFA stats). Additionally, the WLV and SHD have hardpoints in the head, though the SHD has missiles there and WLV has either energy or support weapons.
The SHD's have their hardpoints scattered over the entire mech and, while that makes for a mech not prone to being easily stripped of all its weapons, it also means that it doesn't really have the ability to "shield" with one side or the other or leverage the accuracy buff from arm-mounted weapons very well. Both the GRF and WLV have the bulk of their weapons in a single arm with only missile hardpoints in the torsos, so yes, you can strip them of most of their weapons by removing that one arm, but you can also shield with the opposite shield and make sure the opfor doesn't have easy shots on the weapon side.
As far as loadouts go, each SHD is only able to duplicate the loadout of one other 55-ton mech.
The SHD-2D can duplicate the loadout of a GRF-1N. The WLV-6R can carry an extra ballistic weapon. The GRF-1S and WLV-6K can carry more energy weapons.
Similarly, the SHD-2H can duplicate the loadout of a WLV-6R, but that's it.
I guess I'm just not seeing how these 3 (I'm not even going to bring the KTO into the discussion given its highly specialized hardpoint loadout) are "too" similar.
Could
other things be changed to make them
more different? Sure. As I've mentioned before in this thread, the idea of every mech getting JJs is a bit of a stretch even though I do like jumping King Crabs. I would not object if mech variants were changed to have differing numbers of JJs to fit the fluff in their description.
I would love some Pilot Favorites or the reverse... which I do not think has been mentioned much at all... the XXX Mech is best piloted by a YYY.
That's an interesting suggestion, having mechs that perform better with a certain kind of pilot (Lancer, Sniper, etc). I think the loadouts kind of help dictate that too, but I could see some flavor being added about that. "The Locust is a speedy mech in any hands, but Evasive pilots are able to perform miracles in it." (Having the Evasive Move skill gives +1 max evasion, +20% movement distance, and +1 evasion generated).