It can't play tic tac toe, fine. But I know it gets concepts wrong on things I'm good at. I've seen it generate a lot of sentences that are correct on their own, but when you combine them to form a bigger picture, it paints something fundamentally different than what's going on.
Moreover, I've had terrible results with it as something to generate creative writing; to the extent that it's on par with a lazy secondary school student that only knows a rudimentary outline of what they're writing about. For example, I asked it to generate a debate between Chomsky and Trump and it gives me a basic debate format around a vague outline of their beliefs where they argue respectfully and blandly (both of which Trump is not known for).
It's entirely possible I haven't exercised it enough and that it requires more than the hours I put into it or it just doesn't work for anything I find interesting.
For example, let's say you have a website that sells clothes and you want to make the site search engine better. Let's also say that a lot of work has been done to make the top 100 queries return relevant results. But the effort required to get the same relevance for the long tail of unique queries, think misspellings and unusual keywords, doesn't make sense. However you still want to provide a good search experience so you can turn to ML for that. Even if the model only has a 60% accuracy, that's still a lot better than 0% accuracy. So applying ML queries outside the top 100, should improve the overall search experience.
ChatGPT/GPT-3 has an increased the number of areas where ML can be used but it still has plenty of limitations.