It isn't good enough for most tasks, though.
The whole point of having a computer do something rather than a human, is that the computer will rigidly follow a set of rules and produce deterministic results. A human will get tired or bored, especially with repetitive tasks, and make mistakes, so certain tasks are better automated with such a rigid, rules-based system.
Tasks that are left to humans, such as those that involve weighing up lots of information and making decisions, ones that require in-depth knowledge, or creative tasks (i.e. any task that actually required thinking) can't be done by LLMs, because they are nondeterministic. This can be seen when foolish lawyers use "AI" to cite illusory cases and get found in contempt of court, or when "AI" image generators produce errors all over the place (impossible limbs, too many fingers, lettering that looks like Klingon, etc. etc.) This is because "AI" is a massive misnomer; these are complex statistical models with a random element, there is no intelligence involved whatsoever.
So, what are the use cases? Well, LLMs do have non-generative uses which aren't terrible. Because they are statistical models based on large data sets, they can be used for various types of data analysis, for examples, being used to review large numbers of cell cultures and flag those showing signs of abnormal cells for review by a human, which is potentially useful for cancer screening, or for analysing an ageing code-base with poor documentation to provide summaries and code analysis. Again, though, these still need review by a human.
"AI" is demonstrably counterproductive for legal uses, might be useful for marketing, although people already perceive marketing materials that are obviously produced by "AI" as cheap and inferior, and this only really demonstrates that the whole field of marketing is as much bullshit as "AI" is (calling it "AI" in the first place is the fault of marketing "professionals"), and, if used to write code, produces bloated, non-performant code full of security vulnerabilities that a real programmer must waste their time correcting.
Is a formatting tool for LinkedIn actually useful? To be honest, I have never used LinkedIn, so I don't know. I'd suggest, however, that a tool for formatting your entry in what is essentially a social media site for marketing wankers, is going to be of limited usefulness. Being barely functional for a task that isn't really necessary or appreciably useful in any way isn't exactly a great boast. As for Google; well, everyone I know routinely ignores the "AI" results from Google, because nine times out of ten they are plain wrong (the other time, they are just misleading). "AI" is woefully bad when asked to demonstrate any sort of actual intelligence, simply because it has none.