Not all Medium creatures are the same size so we like the variability. I would let players choose a a number within the range based on a concept, but generally we roll the size and when coupled with the Str score it tells us something about the Character. For example: If I rolled a 6 (above average) for size but only 10 for Strength (average), I know my character is a little portly![]()
Ah, that's very interesting, more randomness in character creation.