I've noticed people who never factor personality into someone's dating success (or lack there of) have common traits:

  1. They think gender is a personality. To them, all men think alike and all women think alike. People never differ in terms of personality, interests, hobbies, actions, culture, values, socio-economics, age, and experiences. To them, the only three personalities that exist are Male, Female, and "Undeserving assholes/bitches"
  2. Constantly surrounds themselves with terrible people. It's so bad that they don't believe sane pleasant people of the opposite gender exist.
    1. With Guys, it's noticing that every girl he complains about looks like she has an Only Fans and spends all her time putting filters on her selfies.
    2. With Girls, it's noticing all her exes and/or her friend's exes are fuckboys, deadbeat dads, and/or violent felons.
  3. Shallowness. This is probably why #2 occurs. If everyone you know is an awful person, chances are you're an awful person too.
  4. Treat dating like prostitution.

Otherwise, I don't understand how someone can think personality can't help or hurt someone's chances in love/dating when it happens all the time. People fall in love after realizing how compatible they are and people fall out of love (or a crush) when that object of affection does something shitty.

"But you need good looks to get through the front door!"
No, you need a bare minimum level of attraction. A person's bare minimum is person-dependent. Some people can take anything over a 3. Some people won't go lower than 7.