Why Excel? I feel there's a gap between a "desktop calculator" (like the default calculator in most OSes) and Excel.
E.g. Desktop calculators I can say, "calculate tax for a single item", but sometimes I need to calculate tax or multiple sums in a list. You can probably break out Excel at this point - though I feel there's a bit of inertia in this. I.e. Thinking of how to structure the sheet, where to put values / formulas / etc.
I feel with a notepad calculator, it's a bit closer to how my brain thinks and I can get simple calcs out quicker. I may be biased too, but I find it easier to read my results the next time I load the sheet in Figr vs Excel.
Btw I'm not saying this is an Excel replacement - there's always going to be a place for that, though I think this is a nice middle ground.
Can you address the elephant in the room: why use Figr instead of Excel?