Studies have shown that the increase in allergies is most probably due to the increase in hygiene! Our immune systems have evolved over many thousands of years to protect us, and our modern obsession with all things anti-bacterial means it has nothing to do! So it turns on things it shouldn't be reacting to - hence allergies. Dettol have as lot to answer for!!
Children DO need to interact with the world around them before they go to school, or they get to school shy, insular and unable to deal with others in the class. Having a forward-facing buggy for an older child (beyond real 'baby' stage, when they are interested in the world around them) allows them to see what is going on, to see their big, wide, fascinating world without craning their necks around the buggy (or pram) sides. Children needing to be aggresive to attract attention is down to bag parenting, purly and simply, not push-chair design. It seems an awful lot of modern 'parents' (and I use the word purely in its biological sense) can't be bothered with their offspring - having them in a buggy facing them would make absolutely no difference to that attitude.