With Sunsinger and the last unlock, Gift of the Sun, you got two grenades.
Starfire Protocol adds an additional Fusion Grenade.
If I have the Fusion Grenade as my default nade and all these things above active, I should have three grenades. Unfortunately, I only get two. I don't like this.
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This isn't new. Starfire basically let's you choose another perk than gift. Personally I recommend angel of light because you can use it to pop off a couple shots you couldn't make from the ground. Or you can use it in crucible to hover above doors and unleash hell from above when the enemy walks through. They NEVER see it coming.