Most would consider cast handstand in a hollow / stretched position throughout as ideal. Coach Nick Blanton referenced this illustration from Championship Gymnastics.
It’s possible to do that technique. (In fact it’s fairly easy on Parallel Bars as a swing handstand.)
But rare on WAG Bars.
I’m personally a very happy coach if the gymnast can lead with the heels (arch) to horizontal, then change the body position to hollow / stretched.
Gymnastics Coaching.com 
Rick, there are so many things (especially in WAG) where the “rules” are in direct contradiction to what makes sense mechanically (dismounts anyone?) that it seems a waste of time to even discuss it…..are we the only sport in the world where the umpires and NOT COACHES make the rules?
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