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James lol.
Its not that the landings are that rough at all(I didn't mean you specifically anyway ^_^), but its when the load is being applied and is greatest for a sustained period(takeoff). Obviously its one of the only times the plane climbs that far for several minutes, so also the only time the increased load is applied for several minutes.
Severe turbulence applies the same kind of danger loading that arises in landings, the fuselage is translating load onto/off the wings in a very short time span causing bump or rebound and then loading/unloading again.
Those are the points at which the fatigue limit for the aircraft super-structure is surpassed. The number of takeoffs and landings is limited for obvious reasons because it is almost a given that the material is fatigued during those processes and hours logged is limited because statistically the plane will encounter x turbulence events in y hours. Upon review it may come to light the plane's superstructure is completely fine because it flies routes with less than average turbulence or something along those lines.
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