I realise that, but particularly in the C42, where the throttle is a stick between your legs which is almost identical to the control stick in say a robin, problems could easily occour if you weren't paying attention when trying to fly a go around for example.
Also, with the stick being in the middle, it's not the most comfortable place to put it, and tends to lead students to subconsiously pull it towards them, and always fly off to the left.