Our operator (A320) says landing lights on for take off and landing and can be switched off/on when appropriate. There is also a guide that during LVPs they may be switched off for landing to avoid any cloud reflections hampering your ability to view the approach lights.
This is allegedly a fuel saving measure as the landing lights rotate down into the airstream causing an (albeit small) increase in drag.
Whenever the lights are on in cloud I have never noticed the reflection off the clouds to be a distraction or to have an adverse effect on my night vision.
If I'm honest, with all that above, I think you're making a bit of a mountain out of a molehill.