Is there a lore reason why the lastalon sucks?

[Inquisitor_Lensoven]

Or is it just as good as a lascannon in the lore?

 

im really trying to figure out how the primaris version of a lascannon, that so far is a vehicle mounted weapon only is so much weaker than the weapon it seemed poised to replace.

[Karhedron]

Looking at the version on the Repulsor, it has the same AP and Damage but trades 2 shots for -2S. I guess that is the compromise, less strength but twice the RoF.

[Orange Knight]

Faster fire rate, less power? More compact.

Seems like a reasonable trade.