i did not say that a person consulting a dealer is an ignoramus. but if you can do something yourself, why ask someone else to do it for you.
here are several examples.
as a homeowner, i have done plumbing repair in my house. if i had more experience in practical electronics, i could perform electrical repair in my house.
i don't have to ask a movie critic, or restaurant critic, or music critic what movie to watch, where to dine, or what performance of chopin's 3rd piano sonata is best.
i think the function of dealer is to provide facts about components and component interaction and then provide components for sale. however, a manufacturer is usually more knowledgeable about component design and component interaction. if the manufacturer has a dealer network, he is delegating these functions to the dealer.
the best source is the person who designed the component. especially when considering speakers and amps, the speaker or amp designer is the best source of information regarding advice about amplifiers and speakers.
the amp designer can tell you what speakers may be suitable to use with his amp, and the speaker designer can proscribe requirements for an amp to drive his speakers. dealers can provide the same information, but the final authority is the designer. he has the technical background that a dealer lacks. how many dealers have designed amps and/or speakers ?
the same applies to digital hardware, especially interfaces and the suitability of transport dac combinations.
if i may make an analogy, a car dealer can sell a car, but a mechanic is the better source for technical info about a car's performance.