I believe something along the lines of what lallara has suggested above - soft clones are a relatively insecure method of immortality, and so capsuleers in general consider themselves 'vulnerable' - they are still more permament/inviolate than poor baseliners, but they do not have the micro-quantum entanglement benefits of the NIS implant.
That being said, the good old networking security acronym 'VIA' (verification, integrity and authenticity) is a can of worms with any modern expression of the facts. Quantum entanglement is our 'tachyon pulse' so to speak, a deus ex machina that saves us from our mistakes with little satisfaction of the pseudo-scientific expression we attempt to bring to bear on it. As the mind is constantly being adapted to new conditions, skills and cybernetic interference, the only live link is the capsule interface. A soft clone is literally a hard back up, and the point of failure in hard back ups lies in the very memory locations they inhabit.
There is a webcomic, I forget which, where the protagonist clones him/herself to become immortal, but an AI tests them against a biometric, psychological and personality auguring battery of challenges, which even a tiny failure of results in the destruction of the clone before it's release - thus ensuring the 'right' personality lives on. Brutal, grim, and not within the remit of current PF. But an interesting option for those paranoid capsuleers who have the means (nullsec outpost clone bays for example) to enforce their own code of practice to ensure that their copy wasn't pilfered or interfered with.
If you want to be securely immortal out of pod, spend that immortality ensuring your own security - the technological equivalent of the crazy unshaven inventor sitting in a bath of dettol screening every door handle for germs on a compulsive basis.