I’m not aware of those complaints, during or after Viet Nam. SF’s were multiple force employers. Rangers were also, just in a different way. Towards the 72-76 push, there may have been some consolidation of line command, but not really enough to warrant any gripes. By the by, SF is not US Army Infantry. US Army Rangers are the US Army Infantry. All other units follow- Lead the Way.
Are you drinking? Your posts are difficult to make out, and confusing.