Regarding 3., the reason it is being ignored is because it may dampen uptake of the vaccine by people who had already had and recovered from COVID. You probably were already aware this was a reason but just to clarify and in case. It's probable that being vaccinated can improve on your natural immunity[1], though since natural immunity can be comparable to or better than immunity from vaccination, it shouldn't be considered necessary in my opinion. At least in Israel, their Health Ministry is recommending people who have already had COVID need only get one dose, as a compromise.[2]
[1] https://www.medrxiv.org/content/10.1101/2021.08.24.21262415v...
[2] https://www.haaretz.com/israel-news/israeli-study-recovered-...