Sales negotiation
A salesperson: "I won't even mention our competitor's after-sales service; everyone knows about their turnaround times, so let's focus on our 48-hour guarantee." The opponent's weak spot is planted, then left to the customer's imagination.
Place the preterition just before your strong argument: the doubt cast over the competitor prepares the ground for your differentiating benefit.
Suggests a competitor's weakness without having to prove it or name it precisely.
The absence of proof makes the insinuation fragile: a buyer may demand the precise fact you are refusing to state.