When I flew B732 we flew fixed speed schedules. F0=210, F1=190, F2=180,
F5=170 F15-150. Now the speed tape shows a weight related man'vre speed of Vref40+40 for F2. F2 is 10kts slower than F1 and 10kts faster than F5. There are many places where 180kts is an ATC speed.
I like the reasoning that using F15-F30-F40 might cause a F30 landing by forgetfullness. This relates back to my point of not using F30 en-route F40 because there is no bug, but there is a F25 bug. Because there is a F25 bug this should alert you to the fact this is not therefore the landing flap setting.