The problem with this is that you have to be able to pick the bottom (or top if short) for the whole day. And now with the new (old) volatility since beginning of February, this can be a dicey situation with the range you are describing. It's all about timing.
As an example, I have been sitting out for a while to try to get a feel for the markets since the volatility spike. Today I finally went back in on what looked like a calm settling of YM after it had dropped 100 points about 2 hours ago. Long at about 24,050.
Just 5 minutes later at about 15:10 ET, the shit hit the fan again and it dropped 300 points from my entry. When it came back to about 23,880 or so I bailed for a ~$850 loss. But look at the ranges today on YM/NQ. They are nuts in comparison to the more solemn days.
Also, don't forget. Per contract, a 50-100 point target in YM is $250-$500. A 50-100 point target in NQ is $1,000-$2,000.
To the meat of your question, I think pure TA has been blown out of the water since February. The equity futures have only one TA favorite that is holding true...The 200 SMA. The rest isn't holding up I reckon'. These are fundamental movers and shakers we be seeing now, and they are powerful. More powerful than these simple ideas of wedges, H&S and trend-channel breaks.
Equities seem to have moved into the foundation territory. TA seems to be dead in this current volatility. HoD, LoD, opening bell, current day's news? It used to be the TA tortoise driving the price action. Looks now that it is the fundamental hare/jackrabbit. And boy, when it kicks, it kicks hard!