This is particularly American sensibility about not drinking alcohol casually around children. It’s very strange. In the UK and Europe, if a kid is having a birthday party at their house it’s completely normal for the adults to be having a casual beer or wine and socialising whilst the children play, obviously not drinking to get drunk and within the legal limits for the driver.
They don’t call them “Serving Suggestions” because they’re mandatory, they call them that because they’re a challenge.