You said it right but the problem starts when the investor is too emotional and thinks that this is still not the right time to buy. And that is because there will be a lower price than they have to wait before everything increases.
The bear market is there to give us the chance to buy as many altcoins as we can but people do forget that it's also the time to get more bitcoins while it's cheaper than what it has achieved for its all time high. That's always being forgotten because everyone seems to be focused on alts gain.
The bear market is the most awaited moment to buy cheap altcoins but we have to buy them at different prices and we have to order at the lowest price compared to the current market price, because the market can go down at any time if it hasn't reached the time for a bullish moment.
Yes, DCA also suits it if you buy at a different price. Actually, it is, and people who have seen the low price would probably think that there's a need for them to wait for some more because they've got a very low price to wait before buying.
You just buy whenever it suits your decision and if the price is right, you all gonna do is buy it and much better in different price because if it's low now, possible that it could be lower by tomorrow or so.