I'm not sure what your point is with the apparent difficulty of understanding the risks of a new vaccine. Are you saying "it's hard, so just trust what the authorities tell you"?
To be clear, we’re talking about the risk of the AZ vaccine specifically. It seems like there might be something specifically wrong with it. Ceding approval authority to bodies like the FDA is how medicine is regulated all over the world. That’s how literal snake oil is blocked from sale. Among other things, it prevents desperate patients from making uninformed, dangerous, and expensive treatment decisions. The average person really isn’t equipped to read a medical study and adequately interpret the results. This information isn’t even at the maturity level of a study, and the risk is that people hurt themselves and undermine the confidence in this vaccine and others.
As for your comments on regulation - yes, that is correct, which is why I was surprised when I got so much flak for pointing out that, at least in the UK, regulatory shortcuts were taken to rush the approval of Covid vaccines.
There were shortcuts taken in all countries to get the vaccines out. In the US, there is no FDA approved COVID vaccine. Every “approved” vaccine is actually under an emergency use authorization.