Users have strong expectations about what features a "spreadsheet" application should have, so I say it merely "feels like" a spreadsheet to help manage those expectations.

For example, in existing spreadsheet programs, each cell gets an A1-style location reference (even in an Excel table or a dynamic array).

That's not the case in Mesh, but it does something similar: a cell's default name is where it was entered in the grid UI, and (soon!) we update that name when the cell gets moved around.