I haven't read the article, but IMO, Steiglitz was singularly important in making photography the "respectable" art form that it is. Not so much because of his own photography, which was great, but for his promotion of it. Not only was Steiglitz a great photographer in his own right, but he had the financial resources and social connections to get the NYC Society crowd into it. Without Steiglitz, Adams, Weston, Baer, all of them would most likely not have been known outside their regional area. But Steiglitz brought them to New York, made the photographers and work known and, most importantly, got them accepted by one of the most important art markets in the world.
So I'm sure Adams was most grateful for what Steiglitz did for him and many others.