I feel like the mother should have said something different. for me this mini arc was bringing back this idea that it’s wrong to idealize the person you love, that’s why I also feel like the mother should have told her something else, Tenjin is nowhere near perfect but Akari being in love couldn’t notice it and the main character has the same thing with Akari regarding not being able to understand that things are not what they seem, but since we’ve seen that before it feels redundant, I guess it’s to show that Akari actually suffers from the same thing as the protagonist.