It's because most people are bad, plain and simple. Heavy ammo is to important to ignore.
And for a defender titan never don't pop your super, if all else fails it's 2 orbs for your team regardless of kills. That's hugely important.
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It's basically free kills. Heavy Machine Gun all the way too! I do usually pop my shield over Heavy Ammo. I thought you have to have a specific perk selected for the Orbs to drop? I've got the perk where when me and my allies are inside my shield, we've all got a ridiculous amount of overshield.