Let me give you an analogy that might help. If I stand in the wind, I am "exposed" to it. This exposure can do all sorts of things like e.g. cool me off on a hot day. But it is very limiting. The wind controls me, not the other way around....
For Nitro, exploiting gamma only requires you to be exposed to it, be it with a single deep OTM option or a portfolio made of millions of complex calls, puts, expirations and strikes. It doesn't matter, if the final gamma of the portfolio is positive, we are long gamma. period.
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On the other hand, if I have wings like a bird or a plane, I can do something with the wind. I can fly. I can now use the power of the wind as a tool. And from the vantage point, I have lifted off a two dimensional world and made my world three dimensional. That is what having two ore more options does to a portfolio [a general statement but I am assuming the person knows how to design such a portfolio].
Of course, your danger has increased as well. You might crash from a great height and die. With great power comes great responsibility. But in the hands of an Peregrine Falcon or a fighter pilot, the extra degree of freedom is welcome.
FWIW.
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