Traveling light works great when you're young and childless. It gets a lot harder to be "light" when you have a diaper bag and a milk pump.
There are always degrees--there are lighter ways to travel with children (being willing to carry soiled cloth diapers versus carrying a volume of one-time-use diapers), but kids often get in the way of the illusion of not needing money or possessions.
Certainly wouldn't advise anyone to take less than they were comfortable with and my message is actually about refining the quality and usefulness of your possessions over the quantity.
There are always degrees--there are lighter ways to travel with children (being willing to carry soiled cloth diapers versus carrying a volume of one-time-use diapers), but kids often get in the way of the illusion of not needing money or possessions.