Very very low risk of hospitalization. So almost certainlymild, but mild can be anything from the sniffles and sore throat to feeling like you have a flu for a week.

But every time you get covid you're playing Russian roulette. Vaccination just greatly lowers your risk. You'll also want to avoid reinfections if possible, as it's hard on your immune system. Stay up to date on vaccinations so you always have antibodies. And no, an infection doesn't give you "super immunity", it doesn't protect you more than a vaccination.

Relying on T cell memory to cure a covid infection is incredibly ill advised. I've seen a lot of people in other places say they are done with vaccinations because their body knows how to fight the virus and can rely on t cells or whatever. T cells kill infected cells, and since covid can infect just about every part of your body, that means potential organ damage. As well as t cell depletion.

The virus is inherently dangerous, it's not just because our bodies haven't been exposed to it. Letting it run rampant is the dumbest way our society could deal with it. Like trying to cure polio by giving everyone polio.