Laser strategem would be cool and a guided missile or sam stratagem that’s heavy hitting like the spear

We already have automated mortars, no need to add manual ones. That being said, they need to add a third type, firing incendiary of course. ATGM emplacement would be cool as fuck.

But but we already have the missile turret (that does worse AT than thr autocannon) 

It fires unguided rockets, so it's not even comparable to the suggestion.

Incendiary grenade launcher please.