[unclebucknasty]

>non-trivial SPA's can't usually be constrained by tools like that because they don't allow for enough flexibility.

Yeah, you've kind of repeated variations of that vague statement, to which I've replied with specific capabilities/features that SPAs and modern webapps tend to use. I've suggested that they represent very common features/layouts that can readily be constructed with the aid of a GUI tool.

But, here, you've now responded with a few website builders that are not intended to be used for the kinds of SPAs/modern webapps we're discussing. That doesn't make a point, except to say that "other things exist".

Do you have specific examples of SPA/webapp functionality that cannot be readily built with the aid of a GUI tool?