Indeed they were, Rick. I debated long and hard about that when building some repros. Ultimately I decided "good enough for Leo, good enough for me" and chose particle-board for the baffles.
I won't dispute the description of your TR and VR cabs since I know you wouldn't deliberately misrepresent anything. I can only report on my own observations with my gear. Apparently in the late 70s CBS era, many different methods were employed for building the furniture. But I think it all substantiates the claims that these cabinets were not as sturdy as those of the BF era and did not sound as good. That said, it's something that can be fixed to make the SF amps sound better, albeit at some cost. Coupled with some minor circuit tweaks and decent tubes and speakers, there's no reason that a SF amp won't provide decades of enjoyable service.