Although you're at Schwab, take a look at "Vanguard Total Stock" in two different forms: as a mutual fund (VTSAX) and as an ETF (VTI). They hold identical contents, and are run by the same company.
When you need to retire, you should not go from 100% stocks to 0% stocks. You still need both portfolio growth and keeping up with inflation. Historically, stocks have been good at that. A conventional retirement portfolio is 60% stocks, 40% bonds.