Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Are Index Funds really as good as “experts” claim?
The point of buying an index fund is that you don't have to pick winners. As long as the winners are included in the index fund (which can include far more than 500 stocks), you benefit on average because of overall upward historical market performance. Picking only the top 50 capitalized stocks in the S&P 500 does not guarantee you will successfully track the S&P 500 index because the stocks in the tail can account for an outsized amount of overall growth; the top 50 stocks by market capitalization change over time, and these stocks are not necessarily the stocks that perform better.  As direct example, the 10 year average annual return for the S&P top 50 is 4.52%, while the 10 year average annual return for the S&P 500 is 5.10%. Issues of trading and balancing to maintain these aside, these indices are not the same.