Why is finger tracking STILL so uncommon with new VR controllers?

For discussion of the Valve Index. I am a huge fan of the index controllers, mainly because they offer full finger tracking, but sometimes it can be a little jank and not quite match up with my real fingers. For years now I’ve been excited about how this feature can be further developed and improved upon to make it more accurate, so why do I never see new controllers from other developers coming out with it? To me, it just seems like the natural next step for this technology, and Valve has already laid a foundation for it. So what gives? Why do no other developers seem to want to explore finger tracking in their controllers?

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