Similar but different to much different. Your concerns are quite valid, I've been thinking this way since before retiring, but not necessarily forming my portfolios around these concerns.As this market goes along I'm getting worried. People think down days are just dips on the way up. From long experience, I know it isn't always so.
So I'm holding to my asset allocation plan quite rigidly - 30% cash and bonds, 25% Canadian equity, 25% US equity, 20% International equity. That means I keep selling the stuff that has gone up and investing in the stuff that's falling behind.
We live very comfortably on our pensions, so our investments aren't critical. If they were, at my age, I'd be cutting back on the equities and buying more fixed income - which has gone nowhere lately. After taxes and inflation, I doubt fixed income even breaks even. But safe, yes. So I have the luxury of being seriously over-invested in equities - for someone my age that is.
Same worries actually.
We would be just fine if every cent we hold is in a money market account. Inflation or not! (stupid, but yes)
I'm (mine not wife's) probably closer to 50% cash equivalents (I count all my ST gov funds as cash, but earn more than MM). All the bond stuff is probably 10%. 40% is all over the map, stocks, PMs, BDC's, REITs. Preferreds, stock funds, weird stock hybrid option funds, inverse funds, etc - all I will say about these, show weakness and I'm out. I mean why not? I can afford this risk, I can afford to lose 8-10% in each, no problem at all. But obviously don't want to, especially more than that.
Statistically speaking, on average, if something goes down 8% or more, it's NOT coming back rapidly. Of course there are exceptions and if you wait, maybe you can break even but at the huge opportunity cost down the drain. Market studies going back years, research performed by IBD shows this to be true.