For millions of people, crypto-currencies are the most convenient way to buy lots of things. I've been buying things regularly with cryptocurrencies since 2011. Domain names, video games, hosting, consumer electronics, clothing, airfare, etc.
2017 marked a pivotal point where Bitcoin specifically abandoned catering to the brick and mortar and e-commerce use cases, and started focusing on large scale financial services. It was a frustrating development for sure, but people all over the world are using various smaller cryptocurrencies to buy groceries every day.
Cryptocurrencies might not be useful for you specifically, and that's fine. Maybe you're not one of the various under-served target demographics. Complaining about that though is a bit like complaining that Yen is useless because you live in the US and none of the businesses you frequent accept Japanese currency. It's undeniably a trillion dollar global economy that provides a massive amount of value to millions.
