Plus, I would also like to say that of all of the loudpeaker, electronics, and wire manufacturers who I have visited over the past 22+ years, most only had 2 or three brands of other people's stuff in their sound/test rooms. They do not have the ability (time, expense, access) to test even 10% of the current models nor have access to everything produced prior.
Finally, not many, consumers realize that even the best companies utilize consultants, metal fabricators, parts suppliers, pay licensing royalties, share patents, buy other's parts, etc. The product that sits on your shelf with but one brand name or the loudspeaker that sits beside it are a combination of many companies efforts and minds.
Sure, a loudspeaker manufacturer can make several recommendations of amplifiers that will yield positive results with their product but they have likely not experienced the number of pairings that but one of their dealers will experience over the course of a single year.
I realize that you mentioned "audio only" dealers but there are already almost none of those remaining. But you also mentioned the term "large" dealerships and such dealerships, to the best of my knowledge, are not audio only.
Finally, not many, consumers realize that even the best companies utilize consultants, metal fabricators, parts suppliers, pay licensing royalties, share patents, buy other's parts, etc. The product that sits on your shelf with but one brand name or the loudspeaker that sits beside it are a combination of many companies efforts and minds.
Sure, a loudspeaker manufacturer can make several recommendations of amplifiers that will yield positive results with their product but they have likely not experienced the number of pairings that but one of their dealers will experience over the course of a single year.
I realize that you mentioned "audio only" dealers but there are already almost none of those remaining. But you also mentioned the term "large" dealerships and such dealerships, to the best of my knowledge, are not audio only.

