Waiting for a retest is necessary when we talk about patterns. As you can see in this scenario, the price tried to break the pattern, but it just created fake-outs. Waiting for a retest will save you many stop losses!
A healthy trend happens when during a bullish/bearish trend is possible to enter after the breakout and the retest of the resistance/support level.
Price made a fakeout on the first support zone. It took liquidity, on the support below, it retested the zone and it flew up.