SLF; what you propose would be reasonable if every take-off would be field limited; i.e. dependent on the length of pavement available. In practice, other limits apply as well, like obstacle and climb limits being independent limitations of the pavement length.
Since it is basically impossible to have all this data -up to date and everything; think of construction sites with cranes in a departure area- of every airport available in the aircraft, tables are mostly provided from an operations department which are guaranteed correct and up to date.