I also tried it and had pretty similar results. I think there is probably a time to use it. Mainly in transition to the high guard just like Kyra did. She had her arm locked over Fujii's head pulling her down and then worked up to the high guard.
1) Immediately got shown the foot / ankle lock.
2) If they roll you can actually get stuck because your legs are locked together and they are laying on them.
I will check out the girl fight links and show them to my daughter. She saw a shirt at the tournament that said "have you ever been choked out by a girl" and wants it so bad. I have video of her first BJJ class I have to edit and post. As any proud dad will say my girl did great.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin