I find it both strange and wonderful that they've kept that part of the track almost the way it has always been.
It's very old-school, tricky and dangerous with the zig-zagging and elevation changes and whatnot. They say when you go uphill after Eau Rouge, you're looking straight into the sky and there's just no way to see the apex you're aiming for. Countless drivers have lost the rear while turning into Radillon, and then it's no tender shunt.
But I guess it's a sort of signature of Spa, and it wouldn't be the same if they modernized the section too much.