Because a Leatherworker can skill up using the pattern and not simply using the scraps. It was also like this in Wrath. Although this skilling (in comparison to Savage to Heavy Savage) is not relevant for WotLK LWs going into Cata at 450, a new player getting to the Cata areas can get to 445 by only using this; which is actually recommended, as they'd need all the made leather to get to 525 anyways.
Spell
Savage Leather
Physical
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
in what zone can you find savage leather cause im out in pandoria and all im getting is exotic leather ?
Tooltip
Combine 5 savage leather scraps to create a piece of savage leather.
Spell facts
SchoolPhysical
Cast time1.5 sec
EffectCreate Item
RangeSelf Only
Taught byLeatherworking (skill 1)
Spell ID84950
Datamined from the current retail build. Numbers that scale with level or stats are shown at their base value.
Creates
Reagents
More Leatherworking spells
Related
Community notes from Wowhead · 7 comments
Top 2 shown above · 1 more hereThe comments below were written by Wowhead users. They are community notes, not TheWoWDB comments. See them in context on Wowhead.
Another reason to have this recipe instead of using the scraps from your inventory is that it gives you skill ups until 450 - pretty nifty if you're wanting to level up LW on a budget.