I have a good way to refute the case for Vanguard Total Stock Market - the following fees:
SCHB, US Broad Market ETF, 0.03% expense ratio (holds about 2000 stocks)
ITOT, iShares S&P 1500 Index Fund, 0.03% expense ratio (despite name, has 3830 stocks)
VTI, Vanguard Total Stock Market ETF, 0.05% expense ratio (holds 3728 stocks)
Vanguard could lower it's Vanguard Total Market ETF expense ratio and still not be the low cost leader.