Seriously, my opinion on Herbert Strong architecture, particularly Engineers, is that it certainly was significant or some of it was.
To me his style seemed to have many elements of the so-called "National School of Architecture", particularly his green-sites and formations whether basically natural landform or made, which would seem logical as Strong cut his teeth in architecture over here around the NY Metropolitan area (Apawamis) which was the homeground of a lot of the National School and its style.
That basic style is generally very bold, particularly on interesting topography with a noticeable engineered look like some of the National School. Strong's style as well as the best of the National School style clearly created some very bold play and play requirements.
I don't know much about Strong's courses but I do vaguely remember Ponte Vedra, and I've played Saucon Old, I vaguely remember Century CC, and I've played Laval Sur le Lac, CC of Harrisburg, and Nassau, the latter few where he did some work.
To me Strong's architecture is most interesting and significant, as it is very identifiably of a particular era and style and type that is most interesting in the evolution of golf architecture in America. A lot was going on in Strong's era and he was obviously one of the prime stylistic movers even if sort of in a bit of a niche of his own.
I think a good one word description of Strong's architecture would be "bold".
Another item that may be very important and very interesting to know about Stong is apparently he spent a great deal of time on-site on his projects and in the end that just may be the most important thing of all to know about him. And he also worked for a brief time with John Low which of course is an interesting connection to consider.
I also grew up within about three miles of Engineers and my oldest and best friend lived immediately juxtaposed to it but ironically I have never actually seen the course or club.
Back in that day, in the 1950s and 1960s and 1970s Engineers was considered around those parts to be an unusual course, pretty quirky and different from most of the sentiment in golf back then. It definitely had a reputation to it but a pretty unusual one---not that unlike the reputation NGLA had back then which most ironically was not a lot like its reputation today.
Perceptions at various times are most interesting, to say the least.