I agree with much of what you are saying here.
Datasets such as graduate outcomes and LEO can provide useful information, but they cannot predict what will happen to an individual student and they need to be understood in context.
That is why the petition asks for clear and recent information about graduate employment prospects rather than any guarantee about a future career or salary.
I also agree that many degrees can lead to a wide range of destinations. The petition is not asking universities to prescribe one career path or predict exactly what every graduate will eventually do. Where a student is considering a particular professional route, however, the known further requirements, qualifications, examinations, experience, time and costs should be clear before they commit.
For broader degrees, realistic graduate outcome information can still help prospective students understand what previous graduates have gone on to do and what the employment picture has actually been.
For me, the important point is that a prospective student should at least know where they stand before committing years of their life and significant money to a degree.
With other major commitments, people expect the important terms and conditions to be made clear before they agree. They may still carry out their own research, but they are not normally expected to discover fundamental parts of the commitment only afterwards.
I am not asking universities to find students employment, provide them with a job or guarantee that they will get one. That is not what the petition is asking for.
Universities already produce detailed prospectuses and extensive course information for prospective students. If they can explain the course, modules, fees and study requirements, why can there not also be a clear section explaining the known career route where relevant, what the degree does and does not qualify someone to do, any further qualifications or experience that may be required, and realistic graduate employment information?
I am not expecting universities to provide every possible piece of information or predict the future. The important information that is already known could simply be brought together more clearly in one place, or clearly signposted from the course information, so that the student has a better idea of what they are going into before they enrol and become financially committed.
Students should still research further and make their own decisions. The point is that they should be starting that research with a clear picture of the known route, rather than trying to piece it together from different places or discovering important parts only after the commitment has already been made.
That is really what the petition is about: giving people the best available information before they make the decision, while they still have a genuine choice.