Gittin 23: Is R. Sheshet Too Harsh on Why Blind People Can't Deliver a Get?

Three mishnayot: Who can write a get? Basically, everyone, even the unexpected categories of people - including a woman writing her own get. The implication of that is that the writing matters less than the signing of the document. Note, of course, that the get must be written for her sake. Also, everyone can deliver a get, except for 5 categories of people including one who is blind and one who is a non-Jew. But what if one of these ineligible people changes status? There are circumstances that would permit the delivery of the get. Plus, why a blind person couldn't deliver a get - even though he should recognize the relevant parties' voices. Also, a third mishnah on the trustworthiness of women - and the delivery of divorces from overseas.