I’m having flashbacks to grad school with all this talk about selecting periods to measure performance as well as which index to use. All indexes have their flaws, but once you get to about 30-40 stocks adding more doesn’t add much benefit in terms of diversification (as long as you very market caps and geography). The problem with the DJIA is it’s a group of large cap stocks which are price weighted - so by definition not diversified.
The S&P isn’t as broad one would think and suffers from being market weighted. The Mag-7 account for about 1/3 of the index and the top 10 stocks in the index are usually around 40% or so.
That said, for the average investor they are better off owning an index fund than trying to chase markets. The people who tend to make real money in markets are those who make the market. So if silver or precious metals are your thing, then you’ll probably do okay if that’s what you focus on. For the average person who wants to enjoy their life, just ignore the noise and invest in a way that helps you sleep well at night.