People who SAY/ARGUE that nowadays parents give less attention to their children than in the past are FREQUENTLY/OFTEN looking back to a SHORT/BRIEF period of time in the twentieth century when MOTHERS/MUMS in middle-class families REMAINED/STAYED at home to look after their children. What these people are SUGGESTING/SAYING is that women nowadays should not go out to work.
THE FACT OF THE MATTER IS THAT/ACTUALLY in MOST/THE MAJORITY OF families in the past both parents worked MUCH LONGER HOURS/MORE than they do nowadays. What has changed is that now in most countries their children ATTEND/GO TO school rather than also working themselves. In that sense they may SEE LESS OF/HAVE LESS CONTACT WITH their parents.
Nowadays, as a result of ACQUIRING AN EDUCATION/GOING TO SCHOOL, children come into contact with teachers who NATURALLY/OF COURSE have to explain why some of their students are failing. What teachers come up with are LOTS OF/FREQUENT stories of parents who are SIMPLY/JUST too busy for their CHILDREN/KIDS. And IF CHILDREN ARE NOT SUPERVISED BY THEIR PARENTS/IF PARENTS DON’T KEEP AN EYE ON THEIR CHILDREN, they will often DO BADLY/UNDERPERFORM at school. However, FAILURE AT SCHOOL/ACADEMIC FAILURE is nothing new even when one or both parents are at home. If children ARE NEGLECTED/DON’T HAVE ATTENTION GIVEN TO THEM by their parents, they will suffer.
I guess children probably had more problems in the past when they and their parents had to work non-stop just to get by. These days, the law looks after children and they can go to school, so children have lots more chances than they ever had before.