The answer is thick, coarse, or damp hair. Milady's clipper-motor comparison table lists pivot motors as best suited to thick, coarse, or damp hair, distinct from the other two motor types in the same table.
The same table shows rotary (universal) motors handling all hair types, wet or dry, with more frequent part replacement, while magnetic motors are suited to tapering, general cutting, and dry cutting on fine textures. Pivot motors specifically trade some blade speed for the higher power needed to push through thick, coarse, or damp hair.
Milady Standard Barbering, 6th ed., Ch. 5 (Implements, Tools, and Equipment), p. 116: "Table 5-4, Compare Clipper Motors: Pivot — High power, Lower blade speed, Blades pulled in both directions — Hair Types: Thick, coarse, or damp."
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