I have found B&W to be as bad as anyone. Frequent model changes and poor parts availability for even their top of line models. My local dealer seemed shocked that I thought they should support something for more than 5 years. I'm a cranky old man, and I don't have much use for expensive throw away consumer products. A $200 DAC fine, a four or five figure pair of speakers not so much. Part of the long term support issue might be ownership changes and migration of production to the other side of the world, but at the end of the day I don't care what their story is if they don't perform.
All of which leaves us with a problem: the little audio companies regularly fail, so no support. And in the modern world, larger companies don't want to warehouse parts long term which may never sell and certainly don't want that expense to harm this quarter's earnings. All of which should temper your desire for "end game" speakers.