Generally, in high end difficult activities (especially solo), a common tactic is to use all your ammo so you get a little kinetic, special, and heavy. With unlimited kinetic, how do we get special or heavy ammo when it's us vs a final boss with no adds and no ammo on the ground? Solo lost sectors just gonna eat the bad RNG and spend 30 minutes pinging tanky bosses with kinetic ammo? Is the new strat to run exclusively kinetic secondaries now so we have a way to deal damage?