That's like saying, there's literally nothing a service business can do for you that you can't do yourself. It's only true in a theoretical sense, if neither time nor resources are a constraint.
In such hypothetical universe, you don't need a dentist - you only need to spend 5+ years in medical school + whatever extra it takes to become proficient with tools dentists use + whatever money it takes to buy that equipment. You also don't need accountants, lawyers, hairdressers, or construction companies. You can always learn this stuff and do it yourself better!
Truth is, time and attention is finite. Meanwhile, SOTA LLMs are cheap as dirt, they can do pretty much anything that involves text, and do it at the level of a mediocre specialist - i.e. they're literally better than you at anything except the few things you happen to be experienced in. Not perfect, by no means error-free - just better than you. I feel this still hasn't sunk in for most people.
