Good really nice and helpful humans will sometimes want to manage your expectations by doing things to assuage a glimmer of hope. This is done not cruelly, but because they don’t want to see you brokenhearted. However, I believe this is a complete disservice to the person.
Absolutely nothing in life is guaranteed. One method of therapy may work for one person and not another. That is just the nature of being an individual.
Ask yourself if you trust your own inner guidance, that is the only guidance you need.
You are uniquely attuned to what is right for you and your family. Guide from a place of really free thinking and you will surprise yourself the directions you choose to go. You owe no one an explanation for your choices. They will have whatever reaction they have, and that is more about them than you.
Be bold. Live free. Do what feels right for you. No excuses and no explanations required.