Why sandisk Extreme Pro UHS1 A2 MicroSD card has less random write read/speed then A1 cards?

I have checked many websites  bechmarks and founded that Sandisk Extreme Pro   A2 card are poor in read write  speed than A1 cards their  sequetial read and write  speed is only  finded  in sandisk card readers Not in mobile and devices and their Random Read speed and  Radom write speed  is too low (approx half of a1 cards) and they recommended to purchase  to UHS1 A1 Cards then UHS1 A2 cards and they are  hard to find and more expensive than A2 cards .

Is it write  if yes then why are a2 latest models are ecomoical  than old a1 cards