This is silly. Their movements are among the most accurate out there, putting watch movements by other highly esteemed brands like Patek Philippe to shame
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...
Now you're just making stuff up instead of doing a simple Google search. Regular Seikos (ie a Seiko 5) can expect around +-20 sec per day. Same with Orient and similar brands that use very cheap automatic movements. Rolex watches often do better than +-2sec per day. If you think the difference between the two is marketing you are either engaging in sophistry or painfully uninformed.
This is the classic Rolex fan. Sort of brainwashed and clueless while insulting to others. Both spring drives and grands are more accurate than Rolexes. Beyond that who even cares. If you want accuracy certainly don’t get a mechanical watch.
If you meant Seikos high end products you should have said those, no one calls Grand Seikos just Seiko since they are very different. With that in mind I don't think we disagree very much here.