No such thing as a "correct" design: it's all about market positioning and design trade-offs. I'm typing this on a sub-$300 laptop, it's made of plastic, it bends and flexes, but it is very light, and has a 1980x1024 display, a 9-hour battery, and again - it bears repeating - cost less than $300 brand new. These factors may not be important to you, but they were to me as I wanted something I could bike with, and wouldn't be too stressed if it broke in a fall[1]. I also have a MacBook, but it's heavy and expensive to repair.

1. It is also something I would have been my dream machine as a poor student in a place with unreliable electric service, yet still attainable, unlike the other "well-made" laptops that have a premium on aesthetics & build-quality.