Average (exc big hitters) PGA drive = 300 yds
HD (pre transition) = 250 / 275 yds
Average LPGA = 250 yds
When you hit off a tee, there’s nothing stopping your swing - it’s all club head speed. Very different from hitting off the green / rough.
Also, general fitness / stamina for going around the course.
See also tactical play - which club you’d use to hit which part of the fairway. It’s not always about driving long distances. So if you play tactically - rather than distance, your driving distances reduce = your overall driving averages reduce.
Tactical round play or overall tactical play (see Lia Thomas re speed).