Tire is 2.8" and I’m about 65 kg, not sure how low I go on pressure since I don’t have a gauge but people routinely go below 10 psi on soft trails.
Pinch flats can happen but it’s harder with bigger tires since there’s a longer travel distance before the pinch. And most people set up tubeless to avoid pinch flats entirely.
That’s why I just pump them up when I’m on (decent quality) pavement.