Olympiathequeen
I understand and have some sympathy for what you are saying regarding disclosure. However, there are circumstances where full disclosure would be wrong. For example, it could lead to the defendant getting hold of personal information about people who have given evidence that has proved to be irrelevant to the case, resulting in that information getting into the public domain. That could deter witnesses from coming forward. The idea of the current system is that the defence should not go on a fishing expedition, nor should they be bombarded by the huge amounts of information collected in a major enquiry, but they should receive everything relevant.
On the whole prosecutors do a decent job of disclosing everything relevant. Where the system falls down it is almost invariably due to the police suppressing evidence and not even revealing it to the prosecution (as happened in this case). Requiring full disclosure of all material isn't going to change that. Those police officers who are willing to bend the current rules to secure a conviction will continue to bend the rules.
Also the prosecution of the woman wouldn’t depend only on the messages in the texts but would depend far more on the statements she made to police which resulted in the prosecution of the man
Prosecution would depend on proving that the statements she made to the police were false. The messages are evidence that suggest the statements were false - from the published reports, it seems they are the only evidence. So, for a successful prosecution, the messages need to prove beyond reasonable doubt that the statements she made to the police were lies. Neither you nor I have seen these messages. They are clearly enough to throw reasonable doubt on her allegations. That is not the same as saying they prove conclusively that sex was consensual and that she was lying. For a conviction the prosecution needs to be able to convince a jury that, beyond reasonable doubt, these messages show that her allegations to the police were deliberate lies.
I fully agree that those women who invent rape allegations, for whatever reason, make the situation more difficult for genuine rape victims.