That is total BS. Springs are NOT based on corner weight alone. A machine used specifically for rock crawling will be much better with a softer spring than a casual trail rider and a casual rider needs a softer spring than a duner and a duner need a softer spring than a desert racer. The difference from a rock crawler to a desert racer will be more than 100# per corner.You guys do realize that a coil springs only job is to hold the vehicle at static ride height, right? And that # is purely based on corner weights and has zero to do with the terrain you ride.......
Then there is spring length and single, dual or triple springs. Then there is the crossover settings for each type of terrain. Choosing the correct spring and setting them up properly is as much an art as the valving.
The rest of what you said is mostly spot on but your claim of springs having "zero to do with terrain" is just plain wrong.