Do you mean water lock?
It’s almost as convenient now, albeit behind a different button: press once on the side button to bring up control center. You should find water lock there.
What’s more annoying, I’ve found, is that end workout now requires two button presses. End and yes, really do end workout. 🤦♂️
Haven given it some more thought, I think the issue is, that what I was looking for was specifically “take me to the next top level comment”. Not “collapse current thread”. In actual effect, it doesn’t make much difference. Nevertheless, it is like taking a detour to get to the destination.
Perhaps both (collapse thread; jump to next top-level comment) could be swipeable options?
Maybe a floating button, visible when viewing posts with comments, could be seen when “jump to next” hasn’t been chosen as a swipe-option? That way, the option will be clearly in place out of the box, but won’t be an eyesore for those who have set up a swipe for the action?