Hello Freediver, your query got my "research juices" flowing. Primarily I had to ask myself, "Hmmm, just how many audio equipment manufacturers are there currently? I went to a data source 9Boldthat I've used previously to get an estimate. Here's what BoldData estimates currently. Worldwide there are (I've rounded their figures) approximately 48,600 audio equipment manufacturers. China leads with 8,000 followed by India with 7400 and U.S. third at 5545. These 3 countries hold 42% of the global market with total sales at about $16.3 billion. Another source is "Mordor Intelligence" with forecasts total sales in this market to reach $23 billion by 2030. Those figures would indicate that the apparent "proliferation" of manufacturers is not hurting the A.E market buy contributing to its growth. Of course, there is a wide range of quality and price points produced within those 48,600 A.E manufacturers necessary to penetrate the diverse global customer base. I was most enlightened after my brief research of this subject. Thanks for your question.
Enjoy the music.