That is true. By investing in bitcoin or altcoin that have a good position at the coinmarketcap, at least we can minimize the risk of getting losses although we still get loss right now. But the chance to make a bigger profit will wide open so we can buy more amount if the price is down again in the next day. If you want to invest in new altcoin, make sure you don't use big money because you don't know if the project was good or not so you can avoid getting losses.
The thing with new alts is that sometimes your gamble will pay off. Of course most of them aren't worth the risk but if you're the kind of person that can afford to lose a small amount, no harm in trying new alts. Many of them have good whitepaper and roadmaps anyways and who knows, sometimes taking huge risks can get suitable rewards.
You are right, and if the new altcoins/tokens can increase in one day, then we can count that as a bonus for us because we can hold for a long time. But still, it is to difficult to find one or more project which has good whitepaper and roadmaps because many of them create a similar project, with the same idea but with the different team.