It really depends I'd say. Here, imo the representation is relatively extreme, you won't find many people who are like this. Me personally, I have a milder case as in i won't recognise you even if we've met 10 times but slowly I will start to remember patterns which makes you unique, like maybe a mole or a scar or the way you do your hair or jewellery etc. in addition to face blindness i have aphantasia,as in i can't form mental images ,which makes it harder for me to remember faces too. Mao mao's father from the apothecary diaries is also an example of someone with severe face blindness, it's also portrayed pretty well imo!

As somebody with face blindness, i am offended. WHERE IS MY HANDSOME MAN WHO I CAN RECOGNISE!!!!! ヽ(`Д´)ノ