>>5481249>he doesn't want to blast everything with his fun fingersLame as fuck.
In-universe gun fingers are just gun fingers. You blast the shit out of everything with 'em and they go everywhere.
Notably, the very fist gun-fingered MS, The Gouf, was actually noted as being given trouble by its gun fingers. The Gouf, unlike later gun finger MS, had machine guns installed each finger of a "glove" that replaced its entire left manipulator. This was noted as difficult to aim and made it harder for the Gouf to handle standard MS equipment (i.e. just Zaku weapons at the time). It could be replaced by a normal left hand, but for these reasons among others the Gouf was passed over for the Dom as Zeon's new ground combat MS of choice.
Gun fingers as a concept never went away though; the Psyco Zaku prototypes,Zeong, Pysco Gundam family, Geymalk, and some other MS would have gun fingers, though these were primarily beam as opposed to projectile weapons.