I think the conclusions are a bit overstated and lopsided. Regardless of the sycophancy (which you can tune), LLMs have infinite patience and attention to details. They also have very little inherent bias - it just mirrors your own mostly. They are, in those aspects, vastly superior to even the best therapists, who can't listen for even a couple of minutes and can't think outside of their limited frames. They are only human.

Try listening to somebody and merely repeating the literal words that they say. I guarantee you, most people can't even reproduce two or tree sentences correctly. And I am not even talking about understanding the words, just the literal reproduction of them, copy-pasta. Humans just can't do it, we are not good at it.

Talking to an AI about your problems is a bit like talking to yourself, but with the added superpower of hours of google searches compressed in seconds. Of course it is dangerous and incomplete, but in a way it also beats talking to humans if you know what you are doing and are looking to and able to solve your problems yourself.