Actually, eyebrows are one of two places on the body that one could actually get permanent hair removal from just plucking alone. The follicular structure is so shallow, and the skin so thin, that the scar tissue from the tissue injury can create a similar situation to the thick callus formed by electrology.
In the Movie Pink Floyd's The Wall, there was a Lloyd's of London policy made up for Bob Geldolf to insure against his eyebrows not growing back when they shaved them off.
The skin at the eyebrows and legs are so shallow compared to the depth of the hair, that one can actually remove all the skin to the depth of the follicle. On the legs, there is also a situation where lowered circulation causes the leg hairs to lessen in later years thereby starving the follicles of the legs for blood. Many older women who have never utilized even temporary hair removal methods find themselves with reduced leg hair, or even hairless legs, in their later years from this biological event alone.
Of course, if one wants sure hair removal, directed at only the hairs they wish to remove, electrolysis is still the best way to go. It is still possible that plucking one's eyebrows will lead to increased thickness, color changes, or follicular distortion.
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Setting a goal is not the main thing. It is deciding how you will go about achieving it and staying with that plan. --- Tom Landry