However, this is a false dichotomy. First, because the same studies that show this ALSO show that getting vaccinated on top of natural immunity is better still ( https://www.medrxiv.org/content/10.1101/2021.08.24.21262415v... ), second because natural immunity prior to the vaccine implies getting COVID and the extremely high risk of complications (from hospitalization, to long COVID symptoms, to death), and third, because there isn't any data around what happens if you get vaccinated first, then get COVID (i.e., is the combination of natural response + vaccine the same if the order is reversed).
There is no situation where getting vaccinated does not help reduce the likelihood of catching COVID, or suffering serious symptoms.