In the short story "The Veldt" by Ray Bradbury, how does the new technology benefit the family?

Ray Bradbury's story "The Veldt" begins with a description
of the technology that relieves the family of tedious and inconvenient tasks such as a
stove that is "busy humming to itself, making supper for four."  As the parents walk
through their ironically named Happylife Home, their approach triggers a sensitized
switch and the nursery flicks on while behind them lights shut
off.

• But, the greatest convenience that the new
  technology provides this family is the thatched nursery, a jungle glade that creates a
  virtual reality, providing the children with hours of
  enjoyment. 


• In fact, there is every imaginable
  convenience provided by technology.  Since the children are at a special plastic
  carnival, the hadleys eat alone.  When George hadley says "We forgot the ketchup," an
  automatic voice within the table apologizes and ketcup
  appears. 


• The house is "wife and mother" to the
  children.  It scrubs efficiently and automatically the
  children. 

Ironically, the technology provides
so many conveniences that there is little left for the humans to do, and little need for
the children to interact with their parents.  This condition of existence is, of
course,  the warning that Bradbury includes in his futuristic
story.