Snow pants without reinforcement panels use the same fabric throughout, with no extra-durable material at high-wear spots like the cuffs and inner legs. This keeps costs down, which is why you'll often see it on budget or fashion-focused pants.
For casual riders who only get out a few times a year or spend more time at the lodge than on the slopes, this can be fine. The pants will still keep you warm and dry—they just won't hold up as well over time.
The real issue is that ski and snowboard edges are sharp, and they'll quickly slice into unprotected cuff fabric. If you ride regularly, you'll likely see fraying, cuts, and holes at the hem and inner leg within a season or two. For frequent riders, pants with at least cuff reinforcement are a much smarter investment.