Satoshis are currently useless because Bitcoin doesn't (yet) have infinite value. The fact that they can't be further divided within the Bitcoin system isn't really relevant.

No matter how much you make the precision there will inevitably be some value which is basically useless unless you make the precision too low and it starts getting in the way of transaction.

There are technical ways this all could be improved— make the creator of an output pay the full fee for redeeming it, so no transaction can cost more to redeem than its worth... but they're not related to precision and may be too drastic to ever adopt anything like them in Bitcoin.