Half body (3 pt tracking) used to receive less attention while it accounts for so much of the player base, notably the quest user-base.
Depending on how high you are from the ground of your play-space, VRChat will chose between three animations to solve the IK for your lower body while in VR, standing, crouching, and prone.
Half-body used to take around 2-3 seconds to load in the leg locomotion (when moving using your play-space and not the thumb-stick) to initialize, so players would often "hover walk" around for a bit when you load the avatar in your line-of sight, which is a related issue that is fixed in the new IK beta thanks to Kung and the VRC team ^^
Leg motion (stepping) does not transition effectively between these modes (crouch prone and standing) and the legs often fail to touch or contact the ground in half-body when crouching.
Having a system that would integrate leg movement for play-space based movements while crouched and prone in half-body would change that.