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I bet your head can calculate the exchange rates of SBD and USD? Or any other currency. :)
I think that makes sense :)

The exchange rate changes daily - even hourly.

That's what the app does, it gets all your posts sums the potential author payouts and converts them into your selected currency with one click.

You'd also have to constantly be scrolling through every comment and blog for new upvotes. It's not a lot but I'm expecting about 1.52 in author rewards from mostly comments. Dozens of them. That's annoying to manually add, refresh, add, etc. And doesn't factor in market variables.