And there are many paddle strops only 1.5 inches wide.

What does it all mean?

Who knows? But if we consider the discussion of what stropping actually does, there should be no difference other than the fact that a thinner strop puts a bit more pressure on the edge because the ratio of weight to contact area is decreased, thereby slightly speeding up any edge aligning that needs to be done (if you consider all other variables to be constant).