I find that adverse comments relating to rudder authority on the Rotax family of VLA/LSA normally comes from people who have become excessively lazy with their feet thanks to Cessna and Piper.
There is nothing intrinsically unsafe with the Tecnam (or indeed the Eurostar, AT3, sportcruiser etc). The problem lies with people who do not understand that the throttle is a control and needs to be handled accordingly - it is not an on/off switch.
Perhaps more of us should hone our skills on taildraggers?
PS. Of all the VLA/LSA, the Tecnam is probably at the top of the list as far as handling is concerned. My only personal gripe is that there is a knack to getting in/out. Then again the Cub, which is possibly one of the most loved aircraft ever, has a 'routine' for mounting/dismounting.