For me, rotating 180deg is way too much, it's slow, I would only do +/-45deg. But that's just me. ... she won the gold medal. Are you saying all the expert judges in the BIGGEST sporting event every 4 years, don't know what they are looking and you know better? this is OLYMPICS!!! Not just any competition.
There is difference between
- your body can turn 180 degree but you don't want to do that, and
- you want to turn 180 degree but your body can't do it.
MA training is to build up your body ability. Whether you want to do that in fighting (for speed reason), that's different story.
It depends on how you may define "speed". IMO, the arm speed is not true speed, the body speed is true speed.
When you move your body so fast that you feel your eye balls is going to fly out of your eye sockets, you have true speed.
In your video, during the beginning of her form (0.47 - 0.55), she moves her arms in circle. If you watch in detail, her body and legs are not moving at that moment. This in CMA, is called "muscle group isolation" which is against the "body unification" - all body parts move/stop at the same time. This may be OK by using Karate standard. This is not OK by using CMA standard.
If a CMA person does that form, he/she may start with a horse hand,
- rise up horse stance while arms move up.
- drop down horse stance while arms move down.
In other words, you should see the "body method" even in that simple move.
- Her body raising should push up her arms.
- Her body drop should pull down her arms.
Without her body raising/dropping, the "body method" is not shown.