Burn-in time Vs. Getting used to a sound


I have had much in the way of high end audio over the years. ...and the idea of an electronic item needing several hundred hours of use before sounding their best..is an accepted idea now (for the most part). Recently I have heard a growing thought of this just being the user getting used to the sound of a product.. Truthfully in the early days of Large Advents, DQ-10 Dahlquists and other gear..there was never any talk of burn-in time... Any thoughts out there on this.... Truth or Hype?
whatjd
It is a FACT:Burn-in time is for real. Even after 3 years worth of break-in time, my solid state components need to time to burn-in for optimal performance. I turn on (CD,preamp/amp)an hr ahead of listening time(no music playing). 20 minutes in to it, sound approaches acceptable. An hour in to it, it gets better. Two hrs in to it and the system really sings. May be there is an objective reasons, how the electronics work.
Do headphones need time to burn in? I just bought a new pair of Sennheiser HD 580s and am wondering if anyone noticed changes in the sound of their 580s over time.
subaruguru.read the latest audio critic[10 biggest lies in audio] I believe this should support my view
listening supports my view not what someone else says. Burn in is for real, no BS.
could what you percieve as burn-in be purely psycological? Possibly buyers remorse for buying a piece of gear that probably doesnt integrate well with the rest of your system [hey, we've all been there] not to be a smartass,bit I still say,as many others have, with the exception of speakers and tubes,burn-in is a sales tool and thats all it is