Some folks wax their thread (for various thread uses, embroidery etc., not just beading.) I have read that it reduces fraying and tangling and can strengthen the thread.
Supposedly it also can alter the desirable properties of the thread-- like the way it reflects light, its luster etc. It can make thread darken over time. I found this article that discusses some of the cons of conditioning thread for embroidery:
https://www.needlenthread.com/2018/03/on-thread-conditioning-beeswax-for-embroidery.html
I've read of beaders waxing their
silk, but this is the first time I've seen it used with Beader's Secret, and am curious about how the thread (which is polyester) behaves when waxed. Edit: I see you use it to make the needle easier to thread. I can see where that would help, on the thread end.
My dad was a tailor, my mother a dressmaker. I never saw beeswax in our home or among their sewing supplies. I still have a number of their spools of thread, including machine grade silk, cotton, nylon, polyester; none of the spools of any kind are pre-waxed.