Moderate odor resistance is perfectly fine for day trips to the resort. You'll get through a full day of skiing without issue—just plan to wash or swap out your base layer that evening. If you're driving home after skiing and have laundry access, this level does the job without any drawbacks.
Where you'll notice the limitation is on multi-day trips. After a day and a half to two days of active wear, odor becomes noticeable even to you. If you're staying in a condo with a washer, you can rotate two pairs and stay fresh. But for hut trips or road trips without laundry, you'll want better odor resistance.
The trade-off is usually price and durability—synthetic base layers with moderate odor control tend to be more affordable and tougher than merino wool. Just don't toss a damp synthetic base layer in your ski bag overnight; that's a recipe for permanent smell that won't wash out.