1. I've known a woman who was touchy feely to the point other women were sure she was into me and it meant jack shit (theater "spiritual" ayahuasca drinking freaks are performatively flirty all like that) ,
  2. I had a girl I've known for years who NEVER touched me not even in a polite buddy way tell me I was the guy she had a crush in college. I would never have known this if I didn't literally drag her out to a party where she later confessed.

Every time I see someone insisting "a woman whose into you will make it obvious" I immediately assume they're American, but even there only a slutty springrbreak type of women "show it" in a direct way, there is a whole segment of introverted, shy women, women who were brought up with a belief the man must chase a bit, or those with a bit of a ego that barely ever initiate unless the guy keeps reaching out.