Growing up in bluegrass country, Dreadnoughts were the only thing with enough volume and punch to sit in a mix with a banjo. By default, that crowned the Martin D-28/35 king. Some high-end boutiques were around as well, but only the handful that could boom like a Martin D-28 ... Froggy Bottom, Henderson, and a few others. Like a muscle car or Harley, there is something "all torque" and no finesse about a D-28 and I don't think I can name a Dreadnought made in the Western U.S. that successfully broke into that market.
Move into a solo act, or a duet of players, singer-songwriter, folk, etc., where the sizes drop down to Concert, Auditorium and Grand Auditorium, then people's tastes open up a lot more, and you see a lot more Taylors and others brands.