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If a person takes the nipple out of the housing, they have to be sure to remove any residue of the tape but most folks only take them out when performing an overhaul of the cylinder. What is surprising, is how loose these things are in the newer off shore manufactured products. Some of them actually wiggle in the threaded bore after you loosen them to bleed. The tooling used is not accurate at all. Back in the day the bleeder nipples took some force to get them to turn even after the needle was broken free of the seat so there was no need for any sealing material.
We have to live with what is available now. If you look at the speed bleeders, they have some type of material on the threads too so that's just what the world has come to these days.