keyboard, screen, or charging port as the things that break

That's exactly where structural reinforcement makes a difference. Keyboard less so since usually it's the switches that break. But ThinkPads have reinforcement not just on the chassis, but the ports too. There's a plate about 1 inch wide on all the ports of my machine. The less all components flex the less likely things break. From simple insertion cycles to actual physical damage, it all adds up over time.