That's a good advice, we can get more profit if we do that. But once again, many peoples are believing bitcoin so that's why they are still choosing BTC to be the only investment. And we can not blame that, because I think bitcoin is a good choice for long-term investment.
The accumulation of bitcoin is our main goal, but the author correctly stated his idea. Altcoins can make good money, but then you need to move to bitcoin. After all, in the future it will be the main currency.