After testing out all of VOLCAN's armors, Dante formed an understanding of how to use them and which one he would use the most often. Some had abilities that showed their effectiveness even when used with the lower level armors. Others won't show their potential unless used with the higher-level armors.
Type 7 was the latter. With light being its specialty, the abilities it had weren't geared for dealing damage. Only once it gets to Level 3 does the Radiant Beam become available, and even then, the amount of energy it consumes with each use and the lack of durability of the armor didn't make it worth the hassle of equipping it, especially with better alternatives.
That much hadn't changed when using it as a Module for his arms. That said, while its destructive capabilities pale compared to other Types, Dante figured out ways to make it useful in a situation where he didn't want to take the lethal approach.
