I thought his eye surgery was going to help with that
I think it helped, but we'll never get the old style back. It might be age, health, or just that he doesn't care anymore, but I just think his style evolved over time.
It makes me think of a comic book artist, Erik Larsen, creator of Savage Dragon (a creator-owned comic book, that he's been running alone since like 1992, so kind of similar to Oda and OP). His art went from clean and bombastic to rough and cartoony over the years, and he got the same criticism as Oda. The difference is he actually talked about it, at length. And without hypocrisy, unlike Oda I think, who is now tied to a huge franchise and his editors.
Larsen acknowledges the roughness and change of style. He thinks his art got better, not worse. He says he could go back to his old style in a heartbeat, and it's not time cutting or phoning it in (might be lying sure). He just likes it better this way. He sometimes even points out huge anatomy or perspective mistakes in his old, more popular work, and how he actually improved over time.
Since 1992, Savage Dragon has been a cop, a super hero, a wanderer, saved the multiverse, died, came back, died again for good, and now his son is the hero. The art style changed over time to follow these new directions, sometimes jarringly. Larsen never gave a fuck. Oda doesn't seem to neither.
Sometimes I wish Oda wasn't tied to the Jump grind, to Toei's and Netflix's billions, etc. These gave OP some of it charms, but took so much away, especially art wise.
Also, fun fact, I didn't like his style when I was a kid and stopped reading. My friend would love the story but absolutely hates the early art and can't keep reading. I got back into OP as an adult around 957 and loved the style. I still do. It's just as I caught up to the scans that I started to notice strange or unreadable panels. And it's often just bad scans and bad redraws. The volumes read 10 times better, except I'm old now and they're too small.