Spread sheets with units would help "can't compare ampere to 1/ampere". As would ditching "the world is one giant grid" in favor of multiple tables as in a relational DB on the screen. For example if you applied a formula to a table, you get a new table instead of some region of cells that happens to be the formula applied to another region of cells. This also solves the problem of having to enlarge the region where a formula is applied when more data comes in.