If I recall, the warning window of the downturn was quite brief as in it came very suddenly. Same with the March rebound this year, the warning was very brief. Price action moves fast atm at turning points.
March 9, 10, and 11 were three days that had already taken out all of the major long term technicals in terms of price action - and if you had gotten short on any of those three days, you would have caught half the move and taken very little heat on the position. Very favorable risk/reward.
I don't have a computer on atm so cannot verify, but 3 days imo is quick historically for sentiment to change bullish to bearish.
Sure is less painful to catch half of a move with very favorable risk/reward confirmation set-up than to make, literally, hundreds of "this is the top" timing calls that are wrong. There is a massive epidemic of Jack Schwaeger "Market Wizards" ideologues on this website who get the market shoved up their tailpipes but they keep coming back for more.
I'm swinging a short on a certain stock, it's up nearly 3000% in 12 months, see if tomorrow's possible pullback has any affect on it, today's sell off didn't.