In 53 years of using PTFE tape on some tapered sump/gearbox plugs I've never stripped or had any thread wear on steel sump threads or alloy gearbox threads.Don't use Teflon tape on a sump plug, as you can easily strip the threads.
A tapered plug will seal by itself, using the correct torque.
Interesting you say this Peter as I've never heard of this before. Do you have any examples or references?