  Current data broadly support trends of galaxy surface brightness profile
amplitude and shape with total stellar mass predicted by state-of-the-art
Lambda-CDM cosmological simulations, although recent results show signs of
interesting discrepancies, particularly for galaxies less massive than the
Milky Way. Here I discuss how perhaps the largest contribution to such
discrepancies can be inferred almost directly from how well a given model
agrees with the observed present-day galaxy stellar mass function.
