Yes, and no

. . . yes, simple concept, but the win rate and R/R will be low.
I don't think that breaking a low after a lower high or a double top let's you know that a trend reversal has taken place.
The problem with the concept you’ve described is that:
- Market tests highs all the time, and breaks the (recent) lows all the time, and therefore institutional traders play lots of games around those last lows to intentionally trap retail traders because the big players know that most retail traders will do exactly what you described, and therefore they’ll take advantage of that and shake traders, trap them, run their stops, and then reverse the price back up. (this applies to US equities and FX)
- Waiting for the confirmation of breaking of that low seems more a trade-through trend entry. Experienced reversal traders are usually very good at reading PA, and therefore they can confidently enter much earlier to maximize the asymmetrical R/R, and at "breaking of that low" they will already have SL at break even, and/or taking partial profits.
- If you wait for the low to be broken, then your stop won’t be in a logical place (unless you place it above the supply level in which case it will screw up your R/R and expectancy.
- ABC (ab=cd) pullbacks break the lows with impulsive legs and this can fool traders, and then consequently the traders who shorted after the break of the low then get trapped.
- If one needs to wait for a confirmation of breaking of that low, then in my opinion it would be better to actually sit on your hand and wait for a downside momentum to develop and then join the ride on the 1rts pullback (safe trend entry), since that way one would have better confirmation (due to more PA info being available), plus the first pullback lets you have tight stops in a logical place and thus retaining positive asymmetrical R/R, plus less chance of getting trapped in the institutional order flow.
Everyone trades differently, and nothing wrong with what you described, and if that works for you, then that’s good, it’s just that this is what most retail traders are taught and the big players know this, and they take advantage of this crowd behaviour to run the stops.
I believe that the most important factor for reversal traders is to understand how institutional order flow works (around key levels), how the big players (who move the market) are thinking, being able to watch the PA for signs of selling pressure (reverse for buys), and if the PA is consistent with the order flow dynamics, and if all these (and few other relationships) fit together, then that’s what makes the potential reversal trade come alive.