Do you still need proof that natural antibodies are superior to the Spike-focused vaccine-induced antibodies ?
There you go: https://www.medrxiv.org/content/10.1101/2021.08.24.21262415v1
https://www.nature.com/articles/s41586-021-03944-y
The article you cited is not science, it is a Bolshevik-style hit piece.
"Secondly, if getting infected right after vaccination increases a young person's risk, that would show up in the data." Yes, this is what's happening in Israel right now.
How about now ?
The flu shots are based on live-attenuated virus. The antibodies generated are fairly similar with the ones after infection. Not the case with the current covid vaccines. However, here's an article about the flu vaccines. https://drjewilliams.com/blog/natural-immunity-flu-shot/