The silver halide crystals in the film emulsion are flatter and more tabular (hence T-Grain).
This requires increasing the surface area of the crystal, and also improving the dye molecules to form a dense assembly.
Tabular crystals tend to lie along the film's surface when coated and dried.
Therefore, when tabular grain technology is described by uninformed writers, its advantage tends to be overemphasized.
For example, excellent reciprocity law is not an inherent property of tabular crystals but rather the result of other techniques introduced at about the same time.