… although I do think there is a bit of fussiness and never being satifiedness (patent pending on new word)
I have had more than a dozen speakers and the break-in period always takes a bit of time, with things opening up and bass developing to one degree or another.
The M3 Sapphires are in an entirely different league when it comes to break in. Just a couple of days ago, after about 800 hours of listening, they transformed significantly. Out of the blue they opened up further and started revealing significant tone and texture deep into the mix with better harmonics and bass. This was with orchestral music where instruments that I had never heard before were suddenly singing clearly and realistically.
Combined with the long time needed to fully realize the potential of the Sapphires is the fact that for most people they do not sound great in the early days and the mid/tweeter is extremely revealing.
The break-in drama is due, most likely, to how out of the ordinary they are. Ultimately they are extraordinary in a very good way, but it does take a disconcerting and lengthy path to get to that point.