I think you might be reading into what the poster wrote the wrong way. the implications of a framework being able to be used the way the poster descibes is that it closely follows existing standards and best practices. So as opposed to forcing you to do things entirely differently, it helps you work the way you might already work. Quite different from an anything goes wild wild west. And as with any language or framework, whether or not it's hard to debug is up to the developer.

It's been a few years since I checked in with Angular because the projects I worked on were distinctively unpleasant, so what I'm about to say may not be current. But at the time, the wide variation in project structure (and available opinionated approaches) and libraries/tooling of questionable support were definitely part of the problem (though certainly not the full extent).

Yeah, if it’s been a few years things are pretty different. The RC era was a little rough, but things are pretty standardized now. I wouldn’t say go start building with it unless it fits your use cases, but certainly don’t stay away from it if you come across it.

I think OP does not mean that Vue is unstructured / non-disciplined. Vue does have a rigid structure and standard though, but it's pleasantly designed and doesn't get in your way. Maintenance has been a breeze for me.