Can any type be represented as a string using setter functions?

[adjenks]

I'm curious whether all types are necessary, or if I can express all types using strings. As in a normal spreadsheet, one does not necessarily have to define the type of a cell as a number for example in order for math functions to operate on it properly.
Therefor when I noticed that RawCellContent can be Date | string | number | boolean | null | undefined, I wondered if it were possible to simplify this to just string in my own wrappers/libraries/interactions, as it would be much more simple to deal with.
So, is there anything that would not work properly if I could never use any type but string? Or could I represent any cell data type using a string input for RawCellContent on setCellValue?