I've read that as well but the design of current tires has changed quite a bit over the years and the reduction in rubber to road traction is mathematically true but the actual surface area of the studs is exceedingly small as well as the stud material and design over the years has improved greatly.
Studies in Alaska, Minnesota, Etc. have show negligible differences in stopping distances on dry pavement over all season and studdless tires.
That being said I live in the northwest corner of NJ a mile from the largest lake in the state and at 1000 feet elevation, it can be sleeting 5 miles south of me but we will get a foot of snow, and my job requires I make it where i have to go no matter the conditions.
Also seeing as the 4Runner runs in RWD normally as opposed to my previous Subaru's AWD system I determined the studs would be a good safety net for any unexpected black ice situations which are pretty common in my area. I have previously always run studless snow tires suck as Blizzaks, Michelin X-ice, and General Altimax Arctics without studs and combined with full time AWD they have proven to be great for 95% of what I had to deal with, so these studs are as much an experiment as anything.
I can tell you from just driving home from the tireshop, they are LOUD and may eventually wear me down to the point where I just go back to Blizzaks or similar.
I'll update this thread throughout the winter with my experiences so hopefully it will contribute useful data to the community and help others make more informed decisions based on a fellow 4Runner's experiences.
Thank you guys!