I agree with a previous post, and that it is 'kinder' on the airframe to use F25 on your way to a F40 landing but more importantly, if you are hand-flying (oh my god, are you crazy!') it makes for a more manageable transition, I think.
The Boeing instructor pushed for F15 straight to land flap during our transition training but I think if they could have removed F2 and F25 altogether they would have but it would have been too much of a change from a Type point of view. One of my pet hates is when a guy calls, 'non standard flap 2.' it's not non standard, use it if you need it. Why use F5 when 2 will do. It's quieter than 5 too!