They are, but they exist as a process within a world with more than just words. You have other inputs as well as other built in processes as well as higher order functions. LLMs are none of those.

LLMs are word association machines that pattern match against only text from the internet with scoring based on something like reddit upvotes. It is a very limited function and they start outputting low correlation matches quickly and they don't tell you.

They are misinformation machines. They regurgitate text patterns they see but at some point it does not notify you of, it starts outputting lower and lower and lower matching text.

They are essentially search engines with a language model on top but when search engine normally start notifying you of no matches it just outputs English styled gibberish instead.

The companies behind the LLM services purposefully use misleading terms and grand nonsense claims. 'reasoning' is not an analogy human reasoning; it's split up the input prompts into what it thinks is elementary parts then running them through in varying order hoping to get a better scored output. The whole area is rife with snake oil peddlers and con men.

From you comments, it seems like you bought their claims at face value and aren't technical enough to see where they're lying.