As with most things, it’s a continuum. Some assimilation is good, a hairstyle, a clothing style, food, even customs. Sometimes certain people can go too far, and it gets more problematic. Think the jeweler in Snatch that isn’t Jewish but pretends to be. The episode of The Neighborhood with Nicole Sullivan. Rachael Dolezal.
One of the first things I learned was to never buy books before the first class.