what does being tall have to do with it?
Average height (5’11”) here and no 125mm drop is not enough.
I normally run my 410mm seatpost at two heights – 310mm exposed for climbing and 140mm for everything else (except jumping where I’d slam it completely).
The new internal routed reverb is 150mm, give it a couple of years and we’ll have a useable range and more reliable droppers, who knows maybe eventually we’ll even have ones that hold a saddle without rotation.
Have a go riding a descent
it’s not simply about descending tho, it’s about getting the saddle out the way allowing you room to move around and control the bike better.