Yes, but that more or less applies to every civilization besides Greeks and Romans regardless of what happened to them (and even the amount of Greek/Romans text

Yes, but that more or less applies to every civilization besides Greeks and Romans regardless of what happened to them (and even the amount of Greek/Romans text that have survived is tiny). Maybe Egypt is an exception. For instance most of what we know about ancient Persia comes from Greek sources. As far as we know more the Greek/Romans had preserved much more information about Achaemenids than their Sassanian successors. Even if Carthage was somehow semi peacefully annexed into the Roman empire and and their upper classes were assimilated into the Roman society over time more or less the same thing would have happen (just that we’d have had a longer window during which Punic texts could’ve been translated to Greek/Roman). This happened all the time after all.