Strless Slinger?

Gunslingers' ranges are highly dependent on weapon attack. For that reason, going str-less forever is definitely going to hinder you. If there was ever a level 90 str-less gun akin to the level 90 dexless claw, then it could be considered that str-less was equal to or better than a concerto user, but probably not to a timeless/reverse blindess user, simply because they have so much more weapon attack.