I was also going to say you will be more likely to bin it quite hard and thus need a bar that can take that abuse.
The reasons I see why DH stuff is built tougher:
More/harder crashes
Faster runs over larger obstacles = higher loads + needs to be stiffer to reduce deflection
most use going down rocky descents = high fatigue risks
Wider = needing to cope with higher bending forces
Also weight is not really so much of an issue so it’s okay and 100g goes a long way to making a bar stronger. Your bars and stem are not places to scrimp on for the sake of a few grams.
I was quite disappointed that my Havoc carbons are 235g as it is a big hike over the havens 170g. The havens felt very (and almost wrong!) light but the havocs have a good heft to them. But they are reassuringly heavy. I don’t use them for downhill but I wanted wider bars than the havens and I wanted something strong that I can trust.
PS a taller rider is probably more likely to put more loading on the bars as there is only so much extra height you can put on the front of bike with spacers, riser stems, bars etc. In the same way for shorter riders the front of a bike is sometimes too high due to long travel fork. And then add that high rise bars need to be built stronger due to the shape.