Hi Spenceroo,
What I believe about the Original Paper Sleeves, and I'm sure this is why we all "convert" over to a better Inner Sleeve, is that the repeated removal, and insertion of the LP will eventually cause scratching to the LP. The Paper IMO, is very abrasive, and not as forgiving as Poly-Plastic, or the very good Rice Paper.
Generally, you'll find on new high end quality releases-reissues, such as DCI, EMI, and of course Mobile FIdelity Sound Labs (yes, there are others as well) that they will come with high quality Poly Sleeves right from the Presser-Manufacturer.
My technique for removing, and re-inserting LPs from thier Sleeve, is to insure my hand never touches the grooves at any cost. I always reach inside the Sleeve, and let my fingers support, and come in contact with the LP at the Label Area only, while my Thumb grasps-touches the very outer edge only. I let the gravity of the LP be supported in this hand, and carefully slide the LP out from its Sleeve, holding the Sleeve with the other hand. It's a bit of a balancing act, but one gets good quickly, without any mishaps. Same process for re-inserting the LP.
Hand oils, dirt, and what other nasties one might have on thier hands is something that should never get on your LPs. Greasy Pizzas, and LPs most certainly don't mix very well! :-)
CDs of course aren't quite so sensitive, or prone to damage, but even these I always grasp from the very edges, and never touch the Playing surfaces. Mark