Tubes were a step along the way to where we are today, which is not tubes to any meaningful extent worth mentioning anywhere but circular threads on "audiophile" forums. There was no sign of tubes on today's Apple conference and Bose does not seem to use them either.
Thank God Apple and Bose are not responsible for what hi-fi is or will become. Even the Millenials are discovering vinyl in huge numbers along with valves. Mid-Fi is what is not happening anymore.
Apple is a marketing company, not a hifi company. Their guiding and driving force is now gone. Bose......I forgot they even existed to be honest.