@NamelessSoldier It's been like that since the begining.
Remember the rotator, it meant that it could rotate everything, including energy, thus making possible to make a black hole.
Kaname's Sigil depends on memory and creativity, very easy to use.
If you have seen Avatar you can easily see the implications of Sui's Sigil
Also remember FL sigil to control every string-like object at free will. That includes ropes and chains but i theorize that it could even control the strings mentioned in the Theory of Strings.
With enough knowledge and creativity, almost all sigils are op