He he he he Yea. The reason is you tie in to a lot of old pipe. When you run into X46 and X52 pipelines the rod of choice when the pipeline was laid was 85 for the X46 and HYP for the X52. Remember these rods were developed for specific pipe grades in the late 1950's and 60's. While steel and welding rod development has jumped forward, these existing lines need to be maintained. 70+ is a much better rod than 85, 85P, or HYP but if you have these old grades, then the old rods are what needs to be used. If the pipeline company has new X65 then sure 70+ is the way to go. But if they are repairing old X46 with new X42 and the original line was welded with 85, then go with the 85. 99% of the issue with the different rods is between the shoulder and the holder.