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The modern design principles would not be able to design a scientific calculator UI. It would be like a dumbass 6 button gadget with a touch screen wizard. There would be debates on Twitter whether numerical input should be up/down or left/right scrollers. Most of the criticism would be about some tiny 1px misalignment and how that's bad design. There would be concept showcases and improvements like adding tweening animations, one comment would say "Oh I love that bounce! ✨". The general concept of a shift button would be entirely alien, let alone two of them. LSK or Line Select Keys (the blank top row buttons) would be considered unintuitive because it has no labels. The new Calc Pro Ultra Max would tout itself as the professional choice, with a grand total of 8 buttons.