It's a perfectly valid question. In my very cautious humble opinion, I think what it means is that the style/size matrix[0] will get squeezed more into a single spectrum: large companies will be pressured into stabilizing and delivering dividends and small ones will compete to grow large enough to get a piece of the passive investment gravy train. Apple can have a bad quarter, but it's just one company. It can't keep having a bad quarter. And if they start to and have to downsize to stay alive, they would by doing that hasten themselves out of a market cap that would qualify them for the index.
There's also no reason why passive indices have to reflect the total market weighted for market cap.
There's also no reason why passive indices have to reflect the total market weighted for market cap.
[0]https://corporate.morningstar.com/US/documents/MethodologyDo...