I see that people support that altcoin suits better for day trading, and not for holding. I just don't get why.
Not all altcoin are only good for day trade. There are some altcoins that is good for holding. If you can see the past chart of known altcoins, you can see that the holders of those coins profit a lot compared to day traders. Because day traders usually get caught when the coin suddenly pump up and never comeback from its previous price.