it just seems a bit dumb to rewrite a basic app that already exists
Texas Instruments and Casio competed for decades over feature sets and ease of use (and also hardware qualities, but that's moot if you're going to run whatever calculator you choose on the same device). Why buy Photoshop when MSPaint comes bundled with the OS? You can change the value of a pixel in a raster graphics file to any arbitrary value in either 🙂
There was a short time when it started only showing fractions and you'd have to rotate the screen to the scientific calculator to get the decimals back. I didn't get round to it, but I almost downloaded a new calculator app as a result.
Texas Instruments and Casio competed for decades over feature sets and ease of use (and also hardware qualities, but that's moot if you're going to run whatever calculator you choose on the same device). Why buy Photoshop when MSPaint comes bundled with the OS? You can change the value of a pixel in a raster graphics file to any arbitrary value in either 🙂