I don't even break open all the bundles before they go into the coolerdor. (I will eventually, I'm a newbie and but right now I have more bundles than empty cigar boxes to put them into.) The cello may slow aging a bit, but it's actually fairly porous and will let both air and moisture (water vapor) pass through.
If you like your cigars totally nude, that's fine; just don't handle them any more than absolutely necessary. I generally just leave them the way I get them; I don't take cello off wrapped cigars, I don't put it on cigars that don't already have it. Check with me in a couple of years and maybe I can tell you if I notice any difference in the way the cigars age.