+1
I don't even know what "frameworks" are, yet I am almost done designing my first website with Site Designer.
I think that relative beginners can indeed be successful using Site Designer, if they do the tutorials.
Well worth the price.
I'm a hack and also went through the whole "Which framework is best" What I got out of the whole thing is that a framework is a bucket of parts, we have Ford, GM, and Dodge. You can use the parts to make a car but the Ford parts don't work on the GM, they may be able to get attached in some fashion but it wouldn't be necessarily a great or maintainable result. So if you built a Ford and want a GM, you gotta start all over. Of course we're just talking about the layout not the content.
As far as what framework to choose...it's a matter of preference just like Apple, Microsoft, Linux, iPhone, Samsung, etc. They all do the same thing. I read that Materialize is geared to manufacturing(I may have made that up), Bootstrap is the most prevalent and Foundation is up and coming just not a s mature as Bootstrap.
And that is all I know (or don't klnow) for what it's worth...