After the dot com bubble burst and my largest holding was down 10% more than the market (i.e. around the figures Lewis is using), I got a cold call from someone pitching professional portfolio management. I still remember my response: I already have professional managers, and I started naming the managers of that fund.
Some of us were not entranced by the ability to trade Fidelity Select funds seven times a day (hourly pricing) back then, and don't feel the need to trade ETFs tick by tick today. I make a change when I can no longer answer the questions: what do I expect from this fund and why is it part of my portfolio?
If I own a volatile fund, I
expect it to go down more than the market. But I also look for it to more than make up that underperformance on the upswing. And I'll wait that out, unless there are specific reasons for me to doubt the fund or the management going forward.
Regarding VFORX, I generally agree that for many employees "one and done" is a great option. I would have loved to have had any sort of asset allocation option available when I started working and had no clue what I was doing.
If one is willing to pay double the expenses (0.11% ER vs VFORX's 0.06%), there's a fixed asset allocation fund that has done a little better. FFNOX correlates 100% with VFORX according to
Portfolio Visualizer. I didn't believe that either, but that's what it says.
PV's performance analysis reports FFNOX having higher annualized returns, lower volatility, smaller max drawdown (based on monthly figures), better Sharpe ratio (to be expected given higher returns and lower volatility), even closer stock market correlation. Though its best year was inferior to VFORX's.
Of course all of these differences are rather small. This is simply an alternative for those who eschew Vanguard or don't like the idea of glidepaths.