Actually…..it’s MUCH better for your pool pole!
Brushing the wall the traditional way can double the bending pressure on the pole compared to brushing with a LongerArm.
I am 5’8” so for me to put ~3 pounds of brushing pressure on the bottom of an 8 foot wall brushing the traditional way I would put 22 lbs of bending force on the pole.
When using a Longerarm under the same conditions I exert 9.6 lbs of bending force on the pole.
http://www.engineersedge.com/calculators/levers/page_levers_1.htm
Note: to further reduce pole bending rotate the brush 180 degrees before each complete pool brushing.