When the pendulum swings back, we’ll remember that looks (and especially the current fashion in looks) has always mattered and will matter in the show business.
Nowadays, lentil-sized incidentals are appreciated, especially in models. Mrs Strakosh was just trying to wake Fanny up to what she perceived as reality. (Cf., Coward’s « Don’t Put your daughter on the stage, Mrs Worthington. »)
And Mrs Strakosh’s analysis makes us sympathize with Fanny and cheer her on. And Mrs Brice stands up to her, besides.
One might say that at least the first quarter of FUNNY GIRL is entirely about looksism. Of course, right.