I can't even type a simple expression with parenthesis. There's no RPN option. There isn't a "financial" setting (only scientific and programmer, for some reason). The list goes on; I'm sure I'm not alone on this one.
It is so, so, so basic it's essentially useless, I end up being forced to open Excel, run Python in the terminal, go on Wolfram Alpha or, worse yet (!!) grab pen and paper to perform basic math.
I know this is unrelated to UWP, but I'd rather they focus less on improving an UI that is inevitably trivial (little boxes with numbers arranged in a grid within a bigger box) and instead added some much needed features.
The fact that I am using a computer must be lost on whoever decided to green light this abomination as the default calculator in any OS ever, let alone one released in the 21st century.