Because energy generated is an after the fact number in any sort of power generation, and doesn't help with any sort of prediction.

Considering nameplate capacity without capacity factor would be bad a prediction?? If I need 1GW of extra energy getting 1GW of solar would be a bad bet. Same if I am calculating the pollution generated next year.

Yes, because load factor are long time averages while electricity generation and consumption are almost real time.

Kind of like 4D checkers or something.

You are really asking after the explanation above?