So what happens for those people who want to go away for more than one or two days?! Penalising people who want to have a holiday...
Not really: my friend, his wife, and their two children (aged 9 and 12) went away recently with FR for a week. They only took two checked bags and managed fine. The checked baggage fees made them consider what they might pack, and they decided to take less and thus pay less. There was no ill-effect; indeed, they said upon their return that if they go away for a few days they'll try just to take hand luggage. Makes sense: less stuff for them to carry and to worry about, and they'll pay less.