i dont know how you ve ended up with this problem.ive been using pole tubes in my van for over a year now and never damaged pole hose when sliding poles in. 
That's gonna depend on the size of the pole, diameter of the tube and maybe the brand of pole hose.
Slap bash, I have modded in a similar way but used rectus fitting so pump need not be turned off, its the same principle as exceed or what wcw is now offering.
Personally I like it and think its great to try new ideas .
Not everybody will agree but for me it works very well.
Similar to advantages Smurf explained
only have one main pole ( if you wish ) and add remove sections quickly
easier and quicker to clean pole sections and hose
keeps van tidier with hose removed from pole ( no tangled mess )