And, again, is one person going to develop those? A person with access to elastic rope might invent the slingshot, but I wouldn't expect them to invent the far superior sling: it's not obvious that the sling is better, since the learning curve is steeper. And a slingshot is not a particularly effective weapon: it's an inefficient bow that can't fire arrows.
You're still thinking in terms of "sighted society versus blind society", which is not what we are discussing. (Unless you're thinking "sighted and superintelligent", in which case I'd say sight is probably redundant.)
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And, again, is one person going to develop those? A person with access to elastic rope might invent the slingshot, but I wouldn't expect them to invent the far superior sling: it's not obvious that the sling is better, since the learning curve is steeper. And a slingshot is not a particularly effective weapon: it's an inefficient bow that can't fire arrows.
You're still thinking in terms of "sighted society versus blind society", which is not what we are discussing. (Unless you're thinking "sighted and superintelligent", in which case I'd say sight is probably redundant.)