Not sure if you are referring to my posts on it, but I have a handful mentioning my thoughts on it if you search for them. I'm not sure its particularly popular setup b/c I've not seen many other posts.
I mostly go by experience and feel. I also like to jump a lot so I gravitate to a stiffer setup, that said this is my do-everything-bike, from green natural trails to all day/weekend at dh parks and everything in-between so it has to be comfortable too, I'm about 145-150lbs geared push into the bike a lot with my legs (I don't know if there is a term for riding feet heavy). I'm no expert by any means but I like to read about suspension setups, listen to suspension experts like Jordi at Fox or Steve at Vorsprung. I started searching for something better when my feet would ache after medium to long rides on a MY21 Stumpjumper, tried changing tokens, air pressure, upgrading to bigger air volume shocks, etc. Then finally tried the SDU Coil with 400 and 450 SAR springs, which I thought would be enough for my weight. It definitely made my feet a lot more happy, but was bottoming a lot even with HBO turned to highest, and riding deep in the travel, lots of pedal strikes, etc. Less so on the 450 but still there,. However I didn't really notice much comfort difference between the two, so I thought I would try the Springdex and I knew the first half of the 430-500 wasn't likely for me so I choose the 490-560 spring and found that at 490 it rode much higher in the in the travel, bike felt much better still and almost no bottom outs with HBO on lowest setting (I adjusted rebound/compression to each spring), but my feet still hurt a bit after long rides. That said the bike felt generally way better, more responsive, my jumping got a lot better b/c with such high spring rate I'm getting much back in return, with minimal-ish damping (IE returns fast without bouncing etc), and it didn't seem to affect my grip on chunk, overall everything felt better. Fast foward two bikes and I'm still using very similar setup with high spring rate and least amount of damping I can get away with and loving it and pairs very well with the high-pivot - which also solved most of my feet discomfort issues, I later learned that my high engagement hub on the Stumpy might have been contributing a lot to the comfort issues, either way love the HP an druid kinematics, not going back.