No, I fully understand that this is great for many users and that it cannot be made harder in any way to make whatever mess you want on a single sheet - or excel would die. I only want it easier to not do that. (There's nothing guiding people to better design right now)
That's by design. People don't want to be "guided to better design," they want to get their math done and over with, leaving some trace (the Excel sheet) for the next time they or somebody else needs to revise that math.
I'd rather want it to stay easy, but offer better refactor tools to clean up the model after the fact.
My main complaint against spreadsheets is that, to get a robust and clean model, you must plan from it from the start, negating the main value of using a spreadsheet to begin with. When moving data and formulas around, it's too easy to break the formulas and not even notice.
I'm not sure you fully appreciate why Excel is so successful.