Some people are not comfortable with crypto currency that is why they do all the necessary research that they need before buying, actually it's not bad for them to do the necessary research before they invest in Bitcoin, but it's more easier to learn from experience than researching without practicing. However because Bitcoin fluctuates some people don't like it, but they don't know that Bitcoin is more stable than other coins in the market. Lastly DCA method is an easy method to invest in Bitcoin, even if you do your research you will still have the same results that DCA is among the easiest methods to invest on Bitcoin.
Most time you don't need to waste your time researching of which cryptocurrencies to invest on , bitcoin already there despite the price is expensive but one can still use different type of methods to keep accumulating, till they have gotten to a point of having good Stashes of bitcoin. Because most of those other shitcoins at there risk is too high . Though bitcoin also have risk attached to it as an investment but compare to others, one can easily minimise the risk in bitcoin especially as an longer-term investors.
It is not a waste of time man, some of these new altcoins gave real potentials and have a bit of strong and genuine foundation, so identifying them when they are still of low value and investing small in it to gather cool amounts that would likely appreciate pretty soon and give you good gains is called spreading your tentacles and not a waste of time.
Remember bitcoin was once of a very low value and not the first crypto currency. Those that researched and found out about it then are called early adopters now.
Investment in crypto as a whole is done with descretionary income and not Emmergency funds, so if the investor has more of them to throw around, a descent altcoin is never a bad Idea, just make sure it does not come inbetween your bictcoin accumulation journey.