Hi all,
it may happen that the max landing weight in some aircrafts is lower than the take off weight that's why you have to install a fuel dumping system.
From an operational point of view (pilots): in case of an air turn back the pilot is able to fly an aircraft that is more maouvreable in landing with the CG advanced (case of fuel dumped ) due to lower weight. The more you add fuel the more CG is moving back decreasing in manouvreability.
From a maintenance point of view: an overweight landing can be possible but you have to verify some structural items in order to verify if the technician is facing only an overweight case or an hard landing case, in order to maintain aircraft airworthiness. As a matter of fact, an aircraft after an hard landing is un-airworthy so is grounded and you have to verify structurally if the energy dissipated during the touch down has bent (permanent deformation) the wings or the fuselage or the undercarriage (or wathever).
In both cases remember always that the TOTAL ENERGY involved during landing is directly linked to the Linear Momentum ( mass * velocity) of the aircraft in changing its movement (also called Inertia) so, to minimize landing damages you have to be as lighter as possible.
Hope I explained right what you requested.
Purgatore75.