On the topic of fuel dump
you can't necessarily dump enough fuel to get below MLW and so
to avoid future confusion based on correct but partial explanation.
Dumping capacity is a necessary evil from engineering and design perspective. As such is preferably not installed unless required by performance considerations, namely
- approach climb gradient for G/A following an immediate turn back at MTOW.
There is no regulatory requirement to reduce down to MLW, a nice Boeing Aero article (T7) explains: overweight is always possible up to MTOW from the LDR / loading point of view. The only concern is the crew needs to find a legal reason to do so. Basically, anything except ops normal is OK.
Neither of the above opposes the prudent decision to reduce and increase margins before attempting to land with a compromised gear.