You say its not helpful (& I understand why) but........in a way it IS helpful.
That is what the majority of people expect a hair piece to look like.
Adverts like that maintain the myth that all hair pieces are obvious.
Therefore, no one will suspect your when you wear yours, because I can assure you it won't look anything like that when you've attached it properly.

Whilst people go around spotting at pieces like the advert, the rest of us go un noticed.