It's not about the serve that is complicated per se stupid fool but the spin. The spin that came back at those points that Mima Ito missed were mostly a downward side spin which is more difficult to do a successful 3rd ball attack than the more simple serves of either SYS or CM.
Downwards side spin, so, you mean side top? And this is something new, not what she has done her entire career? And she should abandon it in game 6 because she had a few unforced errors late in the match?
https://www.youtube.com/watch?v=RceyIBbC08U
I have watched the match and saw very few instances of Ito "completely missing" her third ball, until a few in the sixth game where she had completely imploded. What I saw was a match in which, in the previous 5 games leading up to that point, Ito was winning almost all of her points off the third ball after an aggressive mix of side top serves that got a weak response.
As she has made an entire career out of doing. Sure, you can't win them all, but that was her winning strategy. So I am curious how you see the game differently and think that Ito should have simplified her serves so that she would end up in the rally with SYS and surely be at a disadvantage? And she should have abandoned what was working for 5 games and an entire career just because of a few unforced errors towards the end and a few serves that bounced too high and got power flipped by SYS?
Can you explain what makes Chen Meng and Sun Yingsha' serves simple?
Before you call me a stupid fool, you should understand how point construction works in table tennis.