The "Old and Busted" Iridium satellites flared like crazy because they had big flat metal surfaces for their phased array antennas (that were certainly so shiny completely by accident and never intended to call attention to themselves). the "New Hotness" Iridium satellite antennas are very differ...

In the Space SE question Are Starlink satellites flaring? there was a (now deleted) comment to the effect: I've given up astrophotography because not a single image can be taken that is not stricken out. My question there is specifically about the satellite flare phenomenon, but the discussion ...