I get that 3 gear inches is relatively "greater" at the low end than the high end. I guess I just don't grasp why running an out-spec cassette with a hanger extender that allows a larger cog at the expense of crap shifting performance on the top 3 or 4 cogs is desirable. I guess my years of cycling have led me to embrace that there is a point where the diminishing returns of ever lower gearing is better offset by stronger legs and better conditioning...to each their own.