I'm no expert but my recollection from last time I was looking into buying a watch is that quartz watches are 1-2 orders of magnitude more accurate than even top-end mechanical watches.
Yes, this is true, but almost no luxury watch is quartz (unless you count Seiko spring drive which is hybrid quartz/mechanical). So when people compare e.g. Rolex and Patek movements they are comparing mechanical to mechanical.
It's like saying your Tesla has better 0 to 100 kph acceleration than a 70s Aston Martin V8. The answer is "so what?". You're not driving an Aston Martin V8 for the best acceleration, or the gas mileage, or suspensions, or the ease of maintenance. You buy it because it kicks and roars and slips and smells...