On the contrary, I’ve had a USB cable last multiple phones before. I think the trick is to avoid using it when it’s plugged in as much as possible. Another common pitfall is that microfiber (pocket lint) can build up in the charging port over months and years, resulting in a poor connection. You can usually remove this by turning the phone off and using the tip of a wooden toothpick to gently scrape out the lint.

I definitely think they should include a cable in the box though.