There is a Pinch tool package that demonstrated how to detect pinches (and it fully prefabbed and ready to use) for grabbing, scaling, rotating. It's on their download page for Unity tools.
I don't lament the loss of gesture/pose support, because it was a very high level way to interact with the hands. Interacting with poses takes you away from the raw data. The important thing to know is that their hand tracking is drastically improved and you can deal with each bones of each finger of each hand directly - it's dead simple to formulate your own interactions.
For example, I wanted to make a finger gun. I dropped a rigidbody collider on thumb-bone3 segment, and a collider trigger anchored to the palm. When the thumb moved down into the trigger zone (like the hammer of a gun) the gun fires. I'm not sure how I would have implemented that with high-level gesture/pose support, but the tools they have provided are very practical.