You'll never care about all of them all the time, but it's important that you care about your customer's problems most of the time.
Much of business is an exercise in caring deeply about the problems of your customers.
Their needs shift over time, the products and services you need to provide shift over time, but if you are close to those problems, always seeking to solve them, and genuinely want to see them succeed, you will create value for them. This seems obvious, but there are many buyers or founders of businesses that don't necessarily care for their customers (they see it as a good opportunity on some other lens).
Caring for them is key, both as a founder/investor/operator, and when hiring.