Does making decisions by weighing pros and cons change or improve your brain capacity?

I've had to make tens of thousands of decisions over the last 3-4 years of trying write a book and maybe hundreds of thousands of decisions. I went through over 300 book ideas and then narrowed it down to my top 80 - 90 ideas and some of my ideas are book series ideas that can be subdivided down into thousands of other ideas.

Does making decisions by weighing pros and cons change or improve your brain capacity?
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