Patek has not yet been able to create a perpetual where all the indications ( day; date, month) can be adjusted by one pusher; and at the same time also each indication individually adjustable if needed, by separate pushers. Patek perpetuals also do not have a “blocker” mechanism to prevent setting of the date functions during the “(s)witching hour”
I guess Lange scored a point over Patek when it came up with the Datograph Perpetual several years ago with this unique pusher function.