Even if you have a few spare your left in limbo as to when you use them. What if your next two powerful drops in the same slot but you infused on the first drop. It's a waste. Until your drops are at the power cap it's a flawed system I believe.
And you can rarely use them to actually master work anything. I hope this comes across as constructive criticism as that's my intention.
Cheers
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Bungie are just plain incompetent at this point, you may be better off directing your feedback towards someone like Unkown player or Datto or the likes. Maybe just slip in a D2 feedback request amongst the video replies for example ;)