I disagree. One year I was writing a YT fic about a character whose Jewish faith was very important to her. I'm not Jewish, and while the canon had a few interesting tidbits, she wasn't the main character. I did my best to research, wrote my fic, and asked someone who was Jewish to beta. Not only was my beta able to find two things that didn't ring true, but she also found a few other points where the character's actions could be tied more clearly to her faith and upbringing, in ways that brought the fic to a whole new level.

If I had signed up to write for, for example, Reservation Dogs this year, I would definitely look for a sensitivity beta.