Kinetic is not Primary, the weapon slots are based on if the weapon is Kinetic or Energy. You can have 2 Primaries but only 1 Kinetic and Energy weapon at the same time. Bruh
Also just no, primary ammo using trace rifles? NO!!!
^Ive been playing a lot of D1 lately where that is actually the case (minus a couple exceptions I believe). The two are basically synonymous for me at this point.