That's irrelevant tho, Excel isn't meant to be Outlook so why should it also be able to send email straightforwardly? The fact you're even able to send one thru VBA to me shows it is not "too simple for complex tasks", albeit probably ill-suited in this case (and many more, but that's besides the point).
And while the calculator might be marginally faster if you exclude start-time, Excel is still perfectly fine for your use-case it only requires to type one extra symbol than the calculator, namely "=1024*436[ENTER]". Hell, it's probably faster to do it in Excel if you already have an active window. I don't see how it could possibly fulfill the task in a simpler manner.
Is R a bad statistical tool because I can't use it as Photoshop?
Excel is too complicated to send an e-mail for example. You can send e-mail from excel but it's much simpler to do in Outlook.
Excel is too complicated for simple math = if you want to do 1024*436 it is better to fire up a calculator rather than wait for excel to start up.