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From Woodstock to Spice they went from the best industrial design they'd ever done to the worst, presumably all in the interest of cost reduction. The press-fit construction cost them so much for warranty repairs that they redesigned it to be soldered.
They apparently really learned from that, as the industrial designs of the 41C and original Voyager series are very good and that of the slightly later Voyagers (single PCB) is excellent.
Unfortunately things started going downhill again in the 1990s, as HP moved away from double-shot injection molded key legends and metal snap discs.
Since almost no one will spend more than $100 now for a calculator, and $100 now is the equivalent of only about $40 in early 1980s dollars, it's a reasonably safe bet that no calculators with industrial design approaching those of the Woodstock, 41C, or early-mid 1980s Voyagers will ever be mass-marketed again.