On what scale and based on what? Your flawed assumptions?
What would be A+ and what would be F? If bitcoin made the poor, rich you would consider it A+? That makes no sense since bitcoin was not meant to produce profit for anyone.
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Hmmm, I thought B- adoption grade was pretty fair. To me it means adoption (after 12 years) is above average, above expectation, with room to improve.

I'm pretty sure after 15 years, with lightning much more mainstream, middle class will become more fully btc engaged.

By "poor man", I was really thinking more that countries lower on the GDP scale would adopt btc before those higher on the GDP scale  (https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nominal).