[fd111]

For many decades I've kept an HP calculator on my desk within easy reach. I use it regularly for one thing or another. (day job: programmer)

Due to force of habit, my physical calculator is easier and faster to use than on-screen calculators. Not unlike Emacs commands, the calculator interface is burned into muscle memory: my fingers know how to use it more than my brain does.

I use an emulator app on my phone when not at my desk, but it's always unsatisfying. Real calculator buttons give me some kind of brain-stem level of satisfaction that a functionally identical phone app can't match.