Most people using AI aren't necessarily shooting for a perfect 100. They're often aiming for something more like a 60 or 70. If they really need a 100, they'll probably hire a professional.
But a lot of people simply don't have the budget, the connections, or even the ability to articulate what they want in a way that an artist can easily understand. Conversely, not every artist has the communication or client-facing skills needed to really align with what the client has in mind.
In that context, AI can still be a huge improvement over the 10 or 20 they might otherwise manage through DIY.