I can only share how I decided on whether to get the RSV vaccine, and how my body responded.
I have Bronchiectasis, Asthma, mild Coronary Artery Disease, Rheumatoid Arthritis and a history of bronchitis/pneumonia (probably the cause of my Bronchiectasis.) Due to my lung conditions, I am also prone to other, nasty lung infections - which often attack at the end of a virus, when the immune system is taxed.

Also an active senior with young grandchildren we see a lot, a traveler, and a person determined not to have to be isolated to stay healthy.

Based on the recommendations of my pulmonologist, PCP, and cardiologist, I receive all the vaccines for which I am eligible. Last fall, thinking it was too early, we waited to get our Covid boosters and both caught Covid at an OUTDOOR concert where we sat near a coughing couple for several hours. Not only did we both get it, but before we knew we were infected, we managed to spread it to several friends. It took me 2 months, a course of steroids and one of antibiotics to get rid of the ensuing infections.

Do I react to the vaccines? Every time! So rather than one day with multiple shots, I have to space mine 2 weeks apart - pain in the ?%$#, but a small price to pay. Then I enjoy a few days of feverishness, aches, etc.

PS RSV put two of my friends in the hospital last winter. And left one friend and my brother dragging for 6 weeks.