Ok, let’s go back to last week and ES down to 4100…Personally, I thought it was possibly going to flush down to perhaps lower 4090’s (it was a fast market and trapped a bunch on the run above 4170), so in that example, trader’s discretion where they feel the invalidation point of a pullback into a widely recognized area of support (daily/weekly, etc).
FWIW, I’m not trying to persuade people into scaling/averaging down, etc…merely illustrating that in practical terms in markets that are far more “reflexive” (i.e. waterfall declines and squeezes), it might be near impossible to nail the perfect entry to the tick, but within a range it might be more plausible…(and again, this presumes that one has a certain level of experience to identify areas of support and resistance)