With earlier models that doesn't really work. You really have to read the code and watch it like a hawk or it will make a big mess.
To put it another way, with lesser models you have to guide them at a code level. With Opus 5.5 you only have to guide it at an architectural / feature level.
I am not disputing that the models are getting better for vibe coding. But I think people have very different standards of what a 'big mess' or 'maintainable software' is.
"People said it before and it wasn't true then" isn't really an argument about it being true now. There are plenty of things that happened where the zealots jumped the gun with the hype. Bitcoin for example. "People said bitcoin was going to succeed in 2005, 2006, 2007...". Or even the web. It was mega hyped in the dot com boom and then crashed and of course loaaads of stupid people thought that was the end of it.