My read is that it can infect both kids and adults repeatedly during the winter months. That having it once does build up some resistance. That its harshest for already compromised people but no such thing as long-RSV like there is with covid.

It may be 'common' as another stated, but that makes precaution no less necessary; specially as there is no vax, unlike flu/cv19. Combined with its spike in children due to other factors and being easily passed (repeatedly even) between child and adults this winter could prove stressful for a lot of people.