Oh, so now you have to make a choice or pick up the ammo that drops liberally from enemies in nearly every encounter. Unless you were one of those who hid up top in the Nexus encounter so you didn't have to actually engage in the fight. Get some perspective. It's a massively high impact Sniper that you don't have to reload. Icebreaker is a massively high impact sniper that still regens ammo (albeit over an extra 18 seconds). You want to save your synth for heavy? That's fine but now you've made a choice. Use your Icebreaker (slightly less) and save your synths for heavy. Want to BH the crap out of something? Use a synth and use less heavy. Sheesh