The Sporting Press in the US is advertiser driven, and will give a distorted view of what is what 100% of the time. Roger Barlow wrote a lot of articles on the Darne, as did John Amber, and a few others. If you recall few articles on the Ideal, or the Robust or Costo, remember, they were out of production, and an editor mostly realized nobody could make any money on them, so an article would only get printed if there was space for it. G. Granger guns are about as easy to obtain here as a Purdey, and few would have the money for or interest in that brand, here. I've seen exactly two G. Granger guns for sale in the states, and they were both priced high, but, well below replacement cost. They are a much easier sale in France.
The Double Gun Journal changed that aspect of sporting publication, as the magazine was about the guns, often from a historical standpoint. There were always plenty of places you could read about the latest plastic pump, or, handgun, but, now we also had information available about double guns of all types that often weren't in production any more.
Someone who read "Outdoor Life" in the 1960s, may have remembered a short article on French guns. Someone who read The Double Gun Journal in the 1990s could find out how to grade a Darne, or, an Ideal, how to get one apart, photos of different grades, and how the owners used them in the field and what they thought of them.
The percentage of users of this board who read DGJ is high, but, the percentage of people who read it out of hunting game license holders is likely pretty small. That hasn't stopped boutique gunrooms, catering to the double gun market, from sprouting up, or boutique ammunition makers from finding a profitable niche between giants like Federal cartridge or Winchester, who can't or won't make specific ammunition for older doubles from all parts of Europe.
The phenomena of Americans who understand and are versed in French guns is a fairly recent, but, positive development. You would most likely miss it if you only considered the popular sporting press in this country.

Best,
Ted