The other main thing is saving to be spent later.

To accumulate enough to quit your dangerous job that makes your bones brittle.

What is air for but to breathe? Still don't want to breathe it faster than you can make it.

Saving money and having a big cushion allows you a certain freedom that living paycheck to paycheck doesn't.

Not only that but you can make the money you are not spending "work" for you to generate even more money.