Looking back on it, MW4 did a lot of things right within the mechlab, even if it wasn't true to CBT.
Endo Steel vs Standard Internals - Standard Internals were heavier but halved all transfer damage, which was useful for zombies. Again, internal choice was dependent on the mech, but it wasn't mandatory for all mechs that could fit it.
Ferro vs Reflective vs Reactive - While each ones value was very dependent on the meta, this was a nice change, you could either make yourself more resistant to certain types of weapons at the cost of weight, or you just run the standard armor. These were much better choices than what we currently have.
XL vs Regular Engine - The only difference between the two was that Reg Engines had double the torso internals to that of XLs to compensate for the bad speed, a mod also gave them a higher heat threshold as well. Again, considering how much Reg Engines are valued in competitive play, I would love to see this kind of thing make a return as well.
Std vs DHS - MW4 didn't make any distinctions (though Clan mechs had better heat dissipation per heat sink), and this was a good thing. Rather than try and implement a broken system, they just scrapped it and put focus into other things. Though it would be cool to see some sort of balance struck between the two (and in an interesting way), it won't affect stock mechs well, that's for sure.
As it stands, there really are not any real gameplay oriented choices behind these items outside of the engines, and this is something that needs to be rectified. You want a good money sink is one that is perpetual, a one time upgrade is not. Example, I don't even bother with a new mech until I upgrade its heat sinks. In a system where both are good options, I will test both systems at least once, and between new builds, updated meta, etc, I may change between the two multiple times making a stronger game and better money sinks. SHS, like MGuns and Flamers, need to change, especially without any equipment tier systems.
Edit: I think the only reason people want them to be removed, is either they don't trust PGI to implement a good balancing system between the two HS, or that PGI isn't willing to change them, in which case a tier system would need to be created (highly doubtful) or that they need to be removed because they are stupid.
Edited by majora incarnate, 25 March 2013 - 02:44 PM.