>>1965806I do car racing, we use those kickbikes to get around the paddock. They are the perfect blend of immediacy and speed for that specific application, where you need to get on get off in seconds and don't care about size. They also work as makeshift wheelbarrows for large parts like transmissions.
For most applications it's either or. Bike offers a superior package in every metric but size, and even there, folded Brompton is the same size as any kickbike if not smaller. If you need really compact and foldable means of transport to take with you, go to Decathlon and get yourself an Oxelo Town 9, it's as good as it gets without electricity.