I've been doing a lot of AI writing for a site - to do it well takes effort. I have a research agent, a fact check agent, a logical flow agent, a narrative arc analyzing agent, etc etc. Once I beat the article roughly into the shape I want it to be, I then read through end to end, either making edits myself or instructing an editor agent to do it. You can create some high quality writing with it, and it is still quicker than doing it the human-only way. One thing I like (which is not reason enough by itself) is that it gives you a little distance from the writing, making it easier to be ruthless about editing...it's much harder to cut a few paragraphs of precious prose that you spent an hour perfecting by hand. Another bonus is that you have fewer typos and grammatical issues.

But of course, like producing code with AI, it's very easy to produce cheap slop with it if you don't put in the time. And, unlike code, the recipient of your work will be reading it word by word and line by line, so you can't just write tests and make sure "it works" - it has to pass the meaningfulness test.