I just measured the length of my little seat that I often use in the forest when hunting moose. The legs are 47 cm long. This is low enough for a short guy like me (175cm tall) to sit comfortably while resting my elbows on my knees when I shoot at longer distances.

Even for a tall person, the tripod legs lengths of 60, 70 and 80 cm sound unusually long. At least for trying to use ones knees as a rest when shooting. But maybe these French tripods are just for sitting and not shooting?