Isolation exercises have their place. Lots of folks have muscle imbalances due to occupational injuries and trauma and isolation exercises are a way to correct those imbalances. Obviously see a physical therapist before going ham and making it worse ;).
It also helps to do isolation exercises to strengthen weaker spots in the body that would be the main muscle in a compound movement. I.E. doing leg curls after squats to get a higher volume on those muscles and increase growth.
Yeah, this! I would also like to make a list and pick exercises that I like and then it suggests more more exercises that can fill the gaps of what I still need.
Of course compound lifts are king for most people but there are all sorts of cases for doing isolation exercises. Rehab, strengthening deficiencies, bodybuilding etc.. are all valid use cases for isolation.
It also helps to do isolation exercises to strengthen weaker spots in the body that would be the main muscle in a compound movement. I.E. doing leg curls after squats to get a higher volume on those muscles and increase growth.