I have a 16", a 13" from 2016 (although purchased in 2017), and a 15" from 2014. None of them have any dents or scratches that I can notice. I'm pretty careful with my portables, and to be fair they don't get as used outside the house as much as some people's do. But the two older ones have been to Japan at least once apiece.
The last and maybe only time I dented a portable was with my first-gen MacBook Pro from 2008ish. I was putting it back in my backpack and the bag slipped out of my hands, falling to the floor with the MacBook Pro in it. It probably would have been fine but it landed on a table leg, denting part of the side by the power port. It still works fine today though.