It can be handy to switch on an embedded numpad if you have a lot of data entry. There are also situations where you want to send the proper ASCII codes for the numeric keypad.
One of the workarounds if you are using a TKL board without an embedded numpad is to use remapping software to map your own embedded numpad, but this is dependent upon the remapping software in the computer to which the keyboard is attached at the time, and it is not as handy as having a built-in embedded numpad, as found in the RF 87u and IBM Model M SSK.
In any event, I was curious about which TKL keyboards with embedded numeric keypads might exist other than the RF 87u and IBM SSK.