The same reason that humanoid robots are useful even though we have purpose built robots: The world is designed with humans in mind.
Sure, there are many different websites that solve the problem. But each of them solve it in a different way and each of them require a different way of interfacing with them. However, they all are built to be interfaced with by humans. So if you create AI/robots with the ability to operate like a human, then they are automatically given access to massive amounts of pre-made infrastructure for free.
You don’t need special robot lifts in your apartment building if the cleaning robots can just take the elevators. You don’t need to design APIs for scripts to access your website if the AI can just use a browser with a mouse and keyboard.
The same reason that humanoid robots are useful even though we have purpose built robots: The world is designed with humans in mind.
Sure, there are many different websites that solve the problem. But each of them solve it in a different way and each of them require a different way of interfacing with them. However, they all are built to be interfaced with by humans. So if you create AI/robots with the ability to operate like a human, then they are automatically given access to massive amounts of pre-made infrastructure for free.
You don’t need special robot lifts in your apartment building if the cleaning robots can just take the elevators. You don’t need to design APIs for scripts to access your website if the AI can just use a browser with a mouse and keyboard.