fit for purpose/fit for use

An odd and politically correct way, used by some elderly IT folks , to say that we want or don't want to use such an IT system in our IT solution.

The fit for purpose connotation describe whether or not this use case was foreseen (even in the wildest imagination of some IT architect inventing the system).

The fit for use connotation describe the fact that the system was implemented so well or so badly that it can/cannot be used.

This global system is fit for purpose/fit for use for us.

This system is neither fit for purpose (it does not cover our requirements) neither fit for use for use (i.e. is badly broken and buggered).