before i comment on topic, i just want to think about this...
"simply an optimal delusion..."
that completely blew my mind.
anyways, i used to climb with a slight upwards tilt while sliding the saddle back a small bit. it makes you use your quads and glutes while sitting and grinding away. the saddle was also a tiny bit lower. like 2-3 cm.
now i ride with a level saddle always. it wasn't worth the extra power to be sitting on a log splitter.