OK, so there are many useful applications for being able to sort rows by the history of the cell. In one way this is possible if you have the 'date modified' column in your sheet, but this only shows that something in the row was modified. If you have multiple columns, this requires you to check the cells for which changed last. It would be handy indeed if you could do a sort by modified date for any individual column - so that you can focus on particular columns of interest to you.
Also, why not be able to search for changes made on a specific date.
While were at it, why not add the ability to filter by modified date too (for any column, not just the date modified column)
Basically making the history of each cell a useable parameter for filtering, sorting, and searching.