Imo it's not about horde suddenly learning AV, it's about ally gradually getting worse at it. Galv>IBT>TP>South worked for a long time, idk why people started capping snowfall again. Can't remember it ever being good at all. I'd even advocate for skipping Galv and focusing on towers, but coordination's really weak in AV at the moment. With the trinkets not working at the moment, it's even more crucial to rush southernmost towers and concentration on Capping IBT and TP while leaving IBGY for horde to respawn at to prevent recaps at southern towers.