Absolutely true, buy and hold would be my suggestion for non-traders anyway but that's just me.

Thing is Coinbase is just a sketchy disaster, no customer support, throttling users when price is down so they can't buy and generally just unstable as hell.

Someone once said buying gold is flying in a 747 and buying silver is flying in an F-16 - same speed but vastly different flight experience. Cryptos is about 10 times worse than an F-16 in terms of volatility. If you know that and act accordingly you're good.