“Why are people always so concerned about what others do?”
When I am a guest somewhere for Shabbos, I often question the parents simply because I want to learn from them. I go to different families to see what it is like to raise a family in different areas. I was curious to read this thread because I wanted to see different views. I really don’t think the question is at all hurtful. They made a decision to not push davening, and many people would not mind sharing why.