I don't know that it's ever possible to determine such things as fact. Especially with a character people were complaining about from both sides of the table over 50 years ago. Maggin said when Denny came along that virtually no one wanted to write the character and Denny, a DC MVP, got fed up despite what seemed like a good effort.
Didio is interesting to me. For one I don't know about comments that he hated any property. The generous thing is probably to say he doesn't approach business as a fan, for all the pros and cons.
But he was an accidental Superboy writer who ended up as head of the product almost just as accidentally. He brought back Kara and eventually the Super Sons. He gave us tons of fringe financed by the big stuff, from elevating Morrison, Johns, and Lee to huge positions with some of the biggest comics in the last 25 years across any company. Yet Johns imo had a lot of ideas that didn't help Superman and Berganza is probably the most infamous staff member ever. Didio himself seems incompatible with many fan perspectives and he never seems to take it personally but he does own that.
If something the size of WoNK had been better planned or the New 52 didn't fall into chaos for Superman after a year and a half, maybe we'd technically have had the big crossover that he seemingly can't get. But like didio said about the recent CBR article (where Superman 2000 is called their worst screw up with the character), the only thing that's probably worse than the story not written is the story that was.
I know I'm quite far from talking about Williamson (and inferring too much about the people vs the work, sure) but in my head this always tied to the fact that here we are springing out of another Crisis. And especially not hard to bridge the gap because dick grayson was strutting all over that one lol