I was baptized in the mid 50's at the age of 10. I didn't need elder approval. The congregation didn't even have to get a parental permission to dunk me under water. Furthermore, my parents didn't have a family study and I never went over any 80 questions. The only qualification was that I had a towel, swimming trunks and sat in the seats reserved for baptismal candidates. I answered yes (I think) to both questions neither of which referred to any "spirit directed association".
Subsequent to that I behaved as if I were a Jehovah's Witness. If someone asked what my religion was I said I was a Jehovah's Witness. The community I lived in had reason to believe I was a Jehovah's Witness.
Therefore: Jehovah's Witnesses have the right to make a public announcement that I am no longer a Jehovah's Witness if in their judgement I am not representing Jehovah's Witnesses properly.
The real issue is whether a disfellowshipped person gives a rats ass about such a declaration. In most cases a disfellowshipped person probably has some intent to get back in good standing with their family and the organization. With those intentions they aren't going to sue anyone.
If a person is disfellowshipped and doesn't want to be known as a JW anymore he certainly has no intentions of having anything to do with legal aspects.
The real problem is that they disfellowship people who would really like to remain as Jehovah's Witnesses and therefore cause mental anguish for those sincere people who need the support of the community.
I am glad I never sat in on a judicial committee. But in my oppinion there should only be three questions:
1. Can you name your sin?
2. Do you want to continue to be considered a Jehovah's Witness?
3. If the answer is yes the final question is do you want our help in readjusting things?
If a person says they don't want to be considered a Jehovah's Witness anymore they should have no objection to such a public announcement.