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The ability to compile Java to Javascript is only one of GWT's benefits ... the ability to package the associated HTML and CSS into "modules" and later import the modules you need makes web pages the collection of components the author desires.

I can create similar self contained components in JSF and several other languages (frameworks), so I'm wondering if the problem is the author's development technique.

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GWT is definitely not going to help the problem the author is talking about. GWT's "packaged" components still end up as the same markup and CSS. In most backend frameworks I'm talking about the Helpers, in GWT this would be some "View", or whatever isn't the presenter.

You would still need to use different CSS in the two cases mentioned, so it would be two different packaged components in GWT, two different Views. Maybe interiting from one another, but certainly far FAR more lines of code than a conditional / "modifier" CSS class. .testimonial.compact vs just a normal .testimonial, for instance.

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