Unfortunately, not all parents have learned how to communicate effectively with their children–If their child is in shidduchim and is afraid to communicate what is their own sincere wish for the future, that shows a lack of many years of working on lines of communication.
It is naive for people to think that all parents can wake up one day and realize “oh, my child is an adult now and is going to make adult decisions, and we as parents have an achrayus to be supportive”. That takes years of investing in ones child altruistically.
Especially when it comes to shidduchim, years of hard work and open lines of sharing and communication should already be in place.