Generally, masking tapes have a natural rubber adhesive. 3M, as might be expected, offers a whole range of these tapes. One problem is that the adhesive transfers to the surface of the body. Which can be tricky to remove from the freshly cured paint. Or, another problem is simply that when the tape is being removed from the surface, when the demasking is taking place, the tape slivers.
Whole pieces stick to the surface.
Once again, the issue here is to remove the slivers of tape without damaging the surface of the painted body. This can be time-consuming, which has a negative effect on productivity. What happens here is that as the tape is being baked in the oven, it lets go. What gets blown by is paint onto a surface that is supposed to be masked from paint. Which means rework.