Why would you start to modify something without going through the basics first?
Because it is like fixing a compound break with bandaid. It does not work. You think hundreds of suspension tuners are wrong and should just be recommending the right oil? That oil still has to go through the valve and no matter the viscosity if the valve is not controlling the oil right you don't have the right valving. Case in point. I have a TE511, it was was to soft. Gets walloy in the faster stuff. If is just dumped thicker oil in and at a higher level I would then have forks that sucked on the rocks as the high speed would be stiff and still dive badly into deep stuff. And what about the shock? I just had the same bike revalved and resprung by ZipTy and it complete transformed the bike. It is now very controlled, stable, handles better and feels 30 pounds lighter. No oil was going to do this. You keep telling us how we are "doing yourself a disservice by ignoring it" and having messed with valving and springs for the last 30 years of riding and really carry about suspension performance as I think it is the single biggest gain you make to the performance of a bike period I feel you saying all you need to do is change the oil is "doing yourself a disservice by ignoring it" where "it" is valving. IMHO valving and spring rate is everything. Oil is a slight tweak to that. MY onion and the opinion of every suspension tuner I have had a long chat with which is MANY.