They didn't "disable" over/under. It just requires 1% stamina advantage so that people will stop spamming it, and considering how unbalanced the clinch system is, it's the least they could do. Saying it's still possible but rare is just hilarious.
They also buffed single leg bails into back clinch to require less stamina, which is also a nice change to bring back a "forgotten" mechanic.
That being said, normal takedowns do need a small buff.