To be fair - any car can break down...As mentioned, my Megane RS, a 2019 registered car broke down when the fuel pump failed in the summer of last year. Thankfully it did it in a fairly sensible place but I did have my kids in my car on the school run! Just because it's new/newer, doesn't make it immune from failure but I understand your concern.
72k isn't that much a 'modern' run around as long as it has been looked after, and that any concerns are looked at/investigated/monitored - such as new/unusual rattle from the engine, knocks and whatnot.... but it probably best that something like AA/RAC/Greenflag cover is in place just in case. Modern Nissan's seem to fair better at rust/corrosion than they used to, but age does creep up on them eventually and is something to keep an eye on. Mechanical repairs are one thing but once rust sets in, you usually start to chase it around the car and it becomes a bit like whack a mole eventually!
