All this is a concern that we have had for some time over touring boots. They are designed to be light and do everything quite well. The construction has always felt flimsy. In the days before plastic - and decent touring bindings - we used leather boots and nordic bindings, either three pin or cable. This gave us little to have to worry about, also meant for easy repairs because we carried a tube of low temperature glue and some matches for filling a hole made by a torn out binding.
Since the new kit come in we had so little faith that we use normal alpine boots on normal skis with touring bindings. Seeing so may people skiing on Bandit 3 or 4s, fat Atomics, back country Dynastars and Volkls and even Stockli DPs with touring boots on gives me the fear. These boots are designed for going up quickly and down slowly. They are not freeride boots designed for the stresses of pistes or sustained off-piste.
Watching a guide ski - defensively - demonstrates the type of skiing that these boots are meant for. It is important to match the boot to ski to the binding to the skier. That said I use a race boot on a 201 DP Pro and with a Fritschi freeride which may not be ideal but so far so good!