I don't keep many stable coins for my investments in crypto, because it doesn't provide quick profits, like investing in bitcoin and altcoins. But if you really want to be safe in investing in crypto, stable coins are the right choice for anyone.
I personally think stable coins are not the right choice if our goal is to invest,
as you said bitcoin and altcoin are the right choice to invest because the opportunity to make a profit is much greater than investing in stable coins,
even so it all comes back to each person's decision