If it wasnt for volatily how else would you make profits on trading? That's a great thing about crypto. Besides, the biggest currencies are constantly growing if you look at bigger picture meaning that you can also trade long-term.
Definitely, I don't how could they say such thing if they don't even know what volatility means. The volatility of bitcoin is one of its advantage, just like what you have said, it is the reason why we are making profits because its price is increasing everyday, though there are some dumps sometimes, but it is just normal, that is what volatility means.