Universal fit ski socks work perfectly well for most casual and intermediate skiers. These socks have the same construction for both feet—they're slightly shaped for comfort but aren't designed specifically for your left or right foot. The main advantage is simplicity: they're easier to pair after washing and often come at a friendlier price point.
The trade-off is that universal socks may have a tiny bit of excess material on one side of your foot, which can cause slight bunching inside your boot. If you ski in a relaxed style with a comfortable boot fit, you probably won't notice this at all.
However, if you ski in tight-fitting performance boots or are sensitive to pressure points, that small amount of bunching can become uncomfortable over a full day on the mountain. In that case, anatomical left/right socks are worth the upgrade. But don't assume universal means low quality—many premium ski sock brands use universal construction and still deliver excellent moisture-wicking, cushioning, and warmth.