Same w/ TSP and the like. Preaching to stay in Common & Small to minimize market loss, yet the market IS losing. No right train of thought says... "I'll keep buying shares as the market drops... It's simple - look at your TSP. There's a reason overnight re-allocation is available.
I'm calm - my TSP moved. However, there's panic by those watching a chunk of retirement $ go down the drain. Some followed suit, others - ouch... I hear them cringing about their TSP when they hear the market plunged yet again...
Not everyone is in the same situation as you, so your advice isn't that great for most others.
I'm not panicked and I'm still buying...my allocations and distribution within the various funds has stayed the same. Unless you cash out, you haven't lost a dime. Plus, when playing with house money on 100% match on 5% of your gross income, how do you ever really "lose"? Answer: You don't.
If you're in the short game, under 3 years, and didn't already have your money in a more secure state, well, you deserve to "lose". For those with 3+ years, the best bet is to stay the course. Many people, including the best, try to "time" the highs and lows in the market, and they never seem to do it right. Smart play is to buy continually and let it ride...and exactly what I'm doing.
Plus, its easier yet for those working for the GOV, with 5-10 years left to "gamble" in the market when we have a secure pension with 33-40% of high 3 to live on, combined with SS offset. Its also prudent to truly diversify beyond even the TSP, pension, and SS and having a real-estate investment with a current monthly income of $1300, with a projected monthly income of $1500-$1600, makes staying the course an even easier, and a better option.
My eggs have never been in one basket, by design.