At the end of the day, ExponentialETF acknolwedges that concentration itself may or may not be a bad thing - but thinks investors need to be aware of some of the risks of market cap weighted funds.
As Aaron Brown noted recently, “the downside is that market-cap weightings leave you overexposed to overvalued companies, and underexposed to undervalued ones… Inverse-cap gives even better factor exposures and has outperformed significantly since 1997, but who knows what the next 20 years will bring?”
https://exponentialetfs.com/cap-weight-concentration-ever-now/