Doubles serving in competition

Hello, I would like to know why serving in doubles is so much less dynamic than in singles. For example: https://www.youtube.com/watch?v=pRo_9cIPR1M. In this match you can see ma/fan/zhang using only backspin serves with little to no deceptibility. Xu xin is the only one utilising his standard serves. Then there's the rare occasion where Ma long uses a backhand serve at 0:51. So what is the reason for using a much weaker and easy to read serve when they can comfortably use their normal serves to win the point. I don't suspect accuracy to be the issue as I would expect the top four in the world to be able to control their serves to land wherever they want it to. Thank you!

Hi John,

In doubles because your partner needs to deal with the 3rd ball they make the serve usually straight backspin to make the next ball simpler.  Also they focus mainly on keeping the ball short and low to near the centre line a lot in doubles to stop the receiver making an attack. Since the receiver only has half a table to deal with they can be ready for anything that is longer or higher.