While you are sliding with a motor assembly, you may consider backreaming one time at least. The reason is that you will smoothen the well bore and it will help you when you run casing/completion or when you trip back in hole with another BHA.
This is the example based on my experience, I drilled a 12-1/4” section with mud motor 1.5 degree bend and I slid 30 stands without back reaming. When I finish my motor run, I circulated hole clean and pulled out of hole to change to a rotary BHA. When I tripped back in hole, I could not pass where I started sliding therefore I ended up with reaming down all the way to the previous TD. It took me 4.5 hours extra. After I learned this event, I changed my drilling practice. I back ream at least 1 times every slide I made and I rarely had the problem while running casing/completion or tripping back in hole.
In my opinion, you should not use this practice if you are drilling into very soft formations because you will easily lose your angle.
PS, this is my opinion based on my experience. Please ask your boss again before back reaming .