Where there's a will there's a way. It may be difficult or it may be easy, you won't know until you try it. Another user suggested creating a new table type for this. I think it is something to ponder on. Why is it that some people who should be on the user-side of the equation make all of this excuses on behalf of the developer and furthermore enjoy attacking other commenters? Adding Excel is a great addition which I had forgotten I could use since it is not obvious - by this I mean it is not in any menu. Still, you have to get out of Evernote to create a new document and then drag and drop into Evernote. Granted, you will have tons more of funcionality than that which Evernote could ever implement into the app.
You don't have to evaluate contents to such a great level. Excel uses the '=' equal sign to enable formulas in a cell, Evernote could do something alike in place of evaluating every cell. Just some basic calculations at row, column, and cell level. A new table-type sounds like a good idea. One that only does the basic formatting stuff plus the calc.
A little brainstorming here instead of attacking other people for a change. Who knows, I will maybe stick with the Excel option...I don't know.... still some basic calc would be great.