For spells with sustained damage, that way of creating them was fine. Dividing the power in that way would, under certain circumstances, make the magic travel much faster, although it would be less powerful.
But for an Armamentalist's spells, this isn't very useful. It reduces their power, and although the bullets can concentrate this in a small point, it's still not perfect.
That's why compact magic was much better. All the attack power would be concentrated in a single point, increasing its power and making it more accurate.
However, the process of creating compact spells was much more complex. When creating the fabric, your intention must be strong enough to control the element and make it much smaller without losing power.
That's easier said than done. The Arkanometric Fabric will likely explode. How can this be avoided?
Just as Louis' magic was compactly formed, the fabric exploded, leaving him stunned.
