What are the benefits of holding a portfolio entirely composed of the S&P 500 index instead of investing only in Alphabet stock?

GOOG Alpha: 0.0077736

GOOG Beta: 0.933076

R-Squared of Index Model: 0.2084096

GOOG Average Excess Return: 1.70%

GOOG Standard Deviation: 5.59%

GOOG Sharpe Ratio: 0.304

S&P 500 Average Excess Return: 0.99%

S&P 500 Standard Deviation: 2.73%

S&P 500 Sharpe Ratio: 0.361