Modern mechanical watches can do significantly better than COSC, by the way - I have owned an Omega Planet Ocean (c.2500C) for a decade now, for the first seven or eight years it ran consistently 0.7 seconds/day fast - so I just adjusted it back a minute or two every time I unscrewed the crown to correct the date.
Now it is due for a service soon - but still within a couple of seconds a day.
The point I was trying to make is that probably one of the LOWEST selling points of a luxury watch is accuracy -- there are far more accurate, electronic solutions in the watch space. I love mechanical watches, but I hold no illusions as to how they compare to more modern technology as timepieces. :)
I do agree 100%, though - much as I love my mechanical watches, if I happen to be in a situation which requires exact knowledge of the current time, I simply look at my HP Z3801A.
A mechanical wristwatch serves a different purpose - and in addition being good enough for everyday life, much as vinyl is plenty good enough to have us enjoy music, even if there are more high fidelity-solutions out there. Vinyl has its own intangible advantages; as do mechanical watches.
The fact is that most luxury watches are mechanical; the Skywalker X-33 is an oddity in that it's a luxury quartz, which barely exists as a market segment. Mechanical watches are not as accurate, with standard COSC deviation being -4 to +6 seconds... per DAY.