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Later 1970 or so the top carve became less pronounced and more dome shaped. I'm presuming to save on production time and produce more guitars as Gibson was making hundreds a week or so. But there were some anomalies or so later. I had a 1971 54/58 Goldtop standard reissue that had a distinct top carve with a more pronounced "dish" toward the outer perimeter edge binding.
I don’t recall how ‘70s manufacturing changed from the ‘60s manufacturing, but if they started to use computer controlled routers, I would suspect that complex 3D was a challenge. The recurve on a LesPaul can be intricate to program. Carved manually, it can be time consuming, something Norlin probably wanted to minimize.