The elementals are also supposed to have better 'sealing'/harjel, and the trooper themselves are supposed to be better in melee combat too, seeing as all the trials they do versus other branches default to hand to hand when the elemental has the choice, which is described as their forte. I dislike the 'arnold/strongman' build elemental and prefer the 'basketball player' build, tall, much more athletic, and explosively fast with longer endurance, instead of able to pick up heavy things. Kareem Abdul-Jabar running back and forth for an hour+ seems more useful in a power armor suit. Like, the 'mountain' Hafthor started as a basketball player, 231 lbs, before powerlifting and bulking to 400+ lbs 6-8 years later. The faster, longer endurance basketball version seems better suited to soldiering then the much stronger and heavier powerlifter version. Combined with how YOUNG clan soldiers are, and I dont see them as power lifters. Edit: Tall Boxers basically instead of powerlifters.
Sadly, melee weapons in the RPG->TW conversion lose the big thing they do, with the users strength mattering for damage. So an elemental phenotype soldier in the RPG does more melee damage, as the suit enhances, not overwrites the users base strength. In TW, infantry melee doesnt work like that, so an elemental does 4 damage with a leg attack and an IS trooper in captured clan suits also does 4 damage, despite this not being the case with melee in the RPG.