I never felt a disappointment to my parents. They were happy with what I and my sisters did, Education was important to my mother, in particular, and we all went to university
I married, but neither of my sisters did and my parents never showed any disappointment, whether they felt it, we will never know.
However, my parents were of that generation that believed that it was bad to praise children, so any success in life was greeted with satisfaction, but seemed to be just taken for granted, so while all three of us felt secure and loved unconditionally, it was only after my father died that my parent's friend's told us how inordinantly proud they were of us and everything we did and told their friends about our every success.
We both agreed (one sister died in her 40s) what a difference it would have made to us to, now and again, to have had some words of praise, delight or real pleasure from our parents, for them to have told us how proud they were of us. rather than for us to discover they were after their deaths.