worn by men who are either too lazy to bother shaving
Assuming you exclude Sikhs and many extreme Muslims , I agree with you. The only time I had any hint of one was on an extreme "Combat Survival" jungle course but even then I found it uncomfortable. What about moustaches? - I once had a "Viva Zapata" one in the '60's when it was favoured by SF but found I kept being tempted to bite on it. In the end I accidentally shaved a large bit off, and that was the last of it.