For backcountry touring, adjustable poles aren't just nice to have—they're essential. When you're skinning uphill, you'll want shorter poles for efficient stride and planting on steep terrain. On the descent, you'll lengthen them back to your normal skiing length. Fixed-length resort poles force you to compromise on one or the other.
Backcountry poles are also built lighter to save energy on long ascents, and they come with powder baskets that won't punch through deep snow the way smaller resort baskets do. Many fold down compactly to attach to your pack during bootpacks or steep climbs.
Using your resort poles for touring means you'll fatigue faster, struggle in deep snow, and won't have the adjustability you need for safe, efficient travel. If you're investing in backcountry gear, touring-specific poles should be on your list.