More from the article...

... The update offered some improvements! I appreciated the vertical orientation of its scientific mode, because turning your phone sideways is so 2009; the continuing display of each operation (e.g., 217 4 + 8) on the screen until I asked for the result; the unit-conversion mode, because I will never know what a centimeter is.

But there also was a startling omission: The calculator's "C" button -- the one that clears input -- was gone. The "C" itself had been cleared. ...

Yeah, Apple does this.

Back in the day, when Apple iTunes first appeared on the scene, I pondered converting my home PC infrastructure from Windows to Apple.

I purchased an iMac, and started to move everything over. I also purchased an AppleTV box to show my music on the TV.

I soon found out the error of my ways.

For starters, the iTunes software in both the iMac and the AppleTV boxen could not play the FLAC files I had in my music reservoir.

And, it went downhill from there.

So, now, I am back to Windows (for better or worse) for the main PC client here, though I am typing this comment on Linux Mint (worth a look, imho. Far better than what Apple offered to me.)

Long story short, Apple's Walled Garden (i.e., the restrictions that Apple seems to impost upon its customers) were not something I wanted to support.

YMMV.

Typically I don't use the built-in calculators that are provided by the OS.

I strongly prefer a RPN-based calculator.

@#8 ... I still know how to use one of these. ...

I still have the slide rule that helped me through my years in Engineering school.

OK, let me go get it so I can identify it properly, ...

...

...

I'm back from that expedition. :)

OK,slide rules.

Yeah.

I remember my freshman year Engineering lab. my experiments accumulated so much data that I had to spend over 24 hours (no exaggeration) using a slide rule to produce results from the experiment.

Doing standard deviations on a slide rule. {ugh} That just gives me shivers when I remember doing that.

But to your point of slide rules...

I went into the depths of storage here, and pulled out my old (half--century old) slide rule.

It looks like a Keuffel & Esser Co. 4081-3 LOG LOG DUPLEX DECITRIG Slide Rule