Biotech: One long Internship at one company or multiple companies and labs

So S2 got a great internship freshman year at a biotech that’s turned into a year round part time gig. He loves it and it’s been amazing. The only thing I wonder as a parent is - should he be aiming to work at other university labs or labs at other companies to gain breadth of experience? Or is he just as well off at a place that values him and he enjoys where they’re working on their own cutting-edge biotech? An embarrassment of riches really. But he’s first in the family to go the biotech route and I know nothing about that career path.