I am not advocating or suggesting anything, just stating what I am doing. My theoretical downside risk is that spy goes up 100x, my 401ks also go up 100x. I am trying minimize my risk at the expense I may give up some gains if there is bounce up.
Index funds aren’t necessarily safe. Nikkei index has never recovered from its 90s high. NASDAQ took 15 years to recover. Know the risks.