Initial fill can be tricky on a fresh (dry) system. Lots of places for air bubbles to stick in the system even if they are doing a power flush fill with a machine. As the car is then transported and vibrated and tilted repeatedly (moved by truck, then sits at port, then sways constantly on ocean transport ship, then sits at port, then trucked again, then sits at dealer, etc) the bubbles have time to migrate and collect together. Larger bubbles have more of an impact on hydraulic feel than many tiny ones separately. And the difference between outcomes on different cars can literally be down to which ones were angled nose-up on the transport truck vs nose-down.The "nothing, nothing then stop" brake feel sounds like air is in the brake line. Yes, Lotus shipped many Evoras with air bubbles in the brake lines (don't get me started!) and a good bleed fixes everything.