> The largest market cap companies in a given decade, overwhelmingly tend to be under-performers in the following decade.

Yes, sometimes it's important to remind people of the efficient-market hypothesis:

https://en.wikipedia.org/wiki/Efficient-market_hypothesis

You can't beat the market buying stocks using publicly available information, because everybody else knows everything you do. The average seller has no reason to sell you the stock for less than it's worth.

The only way to beat the market without random chance is to know something everyone else doesn't.