You are right how we use cryptocurrency has changed much. Even though it started as way to send digital money without banks people now mostly use it to invest or store money because they see its value grow and its outside normal banking systems. Someone can sell their crypto in tough situation for emergencies which is showing that it is both risky investment and something that can be quickly turned into cash if needed. This makes crypto important part of managing money today even with its ups and downs.
The value of cryptocurreny changes because of its volatility therefore if there are some changes in the market then the price would surely changes so if prices changes then there will a lot of people who will take the opportunity to earn more money that's why people use crypto for different purposes such as for storing or profit as an example. Anyway, even if the purpose of bitcoin isn't used all the time but there are some people who really used it for its intended uses.