Procedural approach can help save a lot of work, but it has to work really well in all cases and dealing with all the possible edge cases while still looking very good can be more work than just having it authored manually in some cases.
Yep, we've found the best way for us is a nice middle ground between the two. Hand authored (with some procedural assistance) poses for hero grips such as pistol grips or charging handles, but fall back to procedural grip if the user grabs elsewhere on the object.
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I suspect this is a by product of tech debt so they went crazy on the chair to "solve"
Good example of the infancy in XR interaction design. Early days.