Professional riders can get away with saddle pointing down. They produce way more power on a given ride than we humans. Pros barely sit on the saddles, most of their weight is supported by their feet. Plus they are also more fit, ride more, younger, etc....They also have different priorities than us. Most modern races are relatively short up to 5 hours. Pros have more issues with foot pain than butt or hand pain. Tilted down saddle with straight seat post will let you have a more aggressive position allowing you to produce more power for a given time. It also creates other problems though...
Pros in the past had their saddles level and has set back seat posts for more comfort since the races were longer.
Novice rides have the saddles tiled down because their sit bones are not accustomed to riding yet. The longer the ride is the more problems tilted down saddles will cause. Riders will slide forward towards the handlebars, will lock elbows to prevent sliding causing neck pain, shoulder pain and handlebar palsy.
Personally I think for longer rides saddle has to be level with the setback seat post with less weight on the rider hands, elbows bent, otherwise pain will set in eventually
Last edited by Andrey; 11-05-20 at 03:53 PM.