For those who want to diversify in their investment, bear market is the perfect time to do that, because bear market helps to flush out scams, and weak projects since we have thousands of fake projects like shitcoins, bear market eliminates them all, and only real projects survive like BTC.
Bear market is a time in the crypto market where the price of bitcoin experiences a continuous downtrend thereby granting investors the privilege to buy bitcoin at DIP prices and increase their profit level. I don't know how the bear market correlate with scams as you said but i don't think it is true, shitcoins can enter the market at anytime and disappear within a short period of time, it doesn't have to happen during the bear season.
Bear market makes it less stressful for people buying bitcoin with DCA, because DCA is easiest, and interesting when the price of bitcoin is down.
Bear market help investors to maximize their profits, it doesn't make the DCA easier. The DCA is just for continuous buying of bitcoins at regular intervals, either on weekly or monthly basis.