What I would like to achieve is to have separate interactions with each finger pinch.
The accuracy of hand tracking at the time of ML1 was such that if you tried to pinch with a finger other than the index finger, the tracking was greatly disrupted.
To what extent has the hand tracking accuracy in ML2 improved?
Hand Tracking is a moving target, with incremental updates from each update. I don't have specific measurable figures to provide, but as of September Software Release - #2 by sengelman, it is quite usable, particularly with MRTK.
So hand tracking will be enhanced in the future with updates on the software side.
We look forward to the release of MagicLeap2.