NastiaFan101 notes in an IG forum thread on Romanian Yurchenkos:
… It pays to do an Amanar with flexed feet, crossed legs, and a slight knee bend because you’re only going to lose -0.10 for each, for a grand total of -0.30. That’s nothing. …
To be fair, almost every gymnast has crossed feet on vaults of 2 1/2 twist or more.
Yet I agree that the deduction should be greater. Gymnasts who can keep form, rewarded more. Crossed feet are a very obvious error.
Some coaches spend more time ensuring their gymnasts keep tight legs twisting, Al Fong, for one.
Gymnastics Coaching.com 