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.

You'll notice I have them weighted. I put compound lifts with the max weight (100) so they will be shown first.

Blanket statements like this are not useful.

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.

how much do you squat?