"Thinking (as a SWE) is still very much the most important skill in SWE, and relying on AI has limitations."

I'd go further and say the thinking is humanity's fur and claws and teeth. It's our strong muscles. It's the only thing that has kept us alive in a natural world that would have us extinct long, long ago.

But now we're building machine with the very purpose of thinking, or at least of producing the results of thinking. And we use it. Boy, do we use it. We use it to think of birthday presents (it's the thought that counts) and greeting card messages. We use it for education coursework (against the rules, but still). We use it, as programmers, to come up with solutions and to find bugs.

If AI (of any stripe, LLM or some later invention) represents an existential threat, it is not because it will rise up and destroy us. Its threat lies solely in the fact that it is in our nature to take the path of least resistance. AI is the ultimate such path, and it does weaken our minds.

My challenge to anyone who thinks it's harmless: use it for a while. Figure out what it's good at and lean on it. Then, after some months, or years, drop it and try working on your own like in the before times. I would bet that one will discover that significant amounts of fluency will be lost.