I disagree with this 'laziness' remark profusely!
Three warp scrolls would help maintain immersion on a long trek. Four even more so, though that's probably the most you'd ever need.
Town portal scrolls have always been about, "Oh, my inventory is getting full - best offload some stuff!" or, "My, my, I'm running low on x - best nip back and get some more!"
Warp scrolls are about, "God damn, it's a long way back across all those rooms, caverns, areas - there must be a quicker way!"
Thus, reach top of rather large building, warp back outside, carry on, plumb the depths of particularly deep cave, warp back up and carry on, reach final area, scale tower, defeat boss, warp back home.
As opposed to hopping back to base every five minutes just to stock up on some more free warp scrolls to ensure you have enough for your next hop and the one after that.
EDIT
Maybe the craftable warp scrolls and the free warp scrolls just need to be two different items entirely? That way you can craft as many as you want for free porting about, while always being able to stock up on at least an in/out combo every time you step out of the settlement.
Now
there's an idea.