I can agree to that, Me and my wife has 3 shots, we both got covid, very mild only felt slightly sick for two days, We got Covid a second time a few weeks later and that time no symptoms or feeling sick at all, first I just tested positive when enter a venue, and a few days later my Wife tested positive at home when just was curious if she might have got it from me somehow.
Our friends that did not take any vaccines got heavy sick, high fever, and was on the edge to call for an ambulance, and they were both knocked out for over a week. First the husband, and his wife followed a week later.
I also hear another unvaccinated friend that got covid, and his case was pretty mild, just high fever, cough and bedridden for 2 days. So I guess it hits different people in different ways depending on level of virus exposure, personal immune defence's etc...
I will probably not go for a 4th vaccine shot knowing that I have been infected twice (at least), Virus is here and we will be exposed to it over and over and every time we will get a natural booster that imho is far more effective that the fabricated ones. Maybe if you live in a rural place and do not meet many people boosters can be a good idea.