I still use all my HP calculators from the 80's and early 90's.
It's all about the keyboard. I can enter enormous streams of numbers and operators and never miss.
The tactile feedback on the HP calculators is one of the those things that defined that product.
It seems like with modern manufacturing we ought to be able to replicate that.
Sure, costly for a volume manufacturer. However, for low volume, boutique manufacturing, you can tolerate a whole lot of "non-optimal" methods that may actually be easier to manufacture even if not cheaper.