Couple of reasons, but mainly speed and avaiability.

I can give Claude a job anytime and it will do it immediately.

And yes, I will have to double check anything important, but I am way better and faster at checking, than doing it myself.

So obviously I don't want a shitty LLM as coworker, but a competent one. But the progress they made is pretty astonishing and they are good enough now that I started really integrating them.