Koolau
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
The (very date selective) stay in the market statistics are always from firms with a vested interest in keeping you in the market. LOL.
One has to have their own strategy which may include rebalancing, changing your allocation as you age, your risk tolerance changes or other life factors come into play.
Yeah, I always chuckle when the gold guy or the silver guy on TV shows a big period of run-up. I've stopped yelling at the screen and just turn down the sound now.
I agree about strategy and agree that it includes the items you mentioned. But hopping in and out of the market based on fear or greed is not (IMHO) a strategy. DW read something a few years back and decided she wanted out of all her equities. A couple of years later I showed her how much she had lost and she jumped back in. I'm hoping "lesson learned" but YMMV.