Spending time collecting data is for improving our understanding of an individual's immune system. Sharing that data helps educate those who are unfamiliar with, but have complete ownership of their body.
Data needs a narrative attached, otherwise it's just noise. There is a point where adding more data doesn't change the narrative, so it's pointless to continue gathering data.
Are the immune responses to the vaccine identical across the trial group? No. Is everyone's response to sars-cov-2 identical? No. Is everyone's immune system unique in its signaling and adaptive behavior? Yes. How is it possible to correlate immune responses by measuring 0.000x percent of the available data? We do not have complete understanding of our immune systems, thus we need more data and most of it can be relevant.
Ok, you can sit in a corner for the next 1000 years while all of that data is gathered for you. A glimpse at your username suggests you have intense bias with regards to the human body and its immune system.