For what it's worth, after 6 days of
Formentor ownership I haven't found the aids to be off putting.
I've found Start Stop okay if you are light on the brake pedal, so feathering it instead of just coming to a complete halt. Equally, the lane assist isn't anywhere near as intrusive as the outgoing Peugeot 3008, infact, I cant really tell if it's doing anything most of the time, only the occasional slight movement in the steering wheel. The 3008's lane keeping assist was very intrusive, so maybe it's relative to what car you are stepping out of.