Im having a hard time having my supplicants die in battle, so I usually just have to be murdering my own supplicants inbetween battles. The main reason for this is because Supplicants are ranged and they have alarak to tank damage for them and if you play well enough you will usually lose very few supplicants. so all in all it seems like bad design because I need them to be dying to buff my mech units.
To correct this I’d reckon they make Supplicants a melee zealot with maybe slightly more HP/Dmg and give Alarak 3 range and maybe even alternative ranged dps based abilities, this way the supplicants will be tanking the damage and actually die in battle and I’ll get some use out of them while also feeding my mech units and I wont have to manually be murdering them. So basically make Supplicants the Tank for your army and change Alarak into either Ranged DPS or Support.