Welcome to capitalism, bro. It's not about rationality, it's about "choice." The landfills and deforested landscapes can testify.
Just how many options does 1 need in a 2 way bookshelf design?
Do we really need this many options in a 5-6" woofer 1" dome or if lucky AMT or Ribbon bookshelf speakers? To me, these are the lite beers of audio design.