One good example of this is the New2DSXL, which often gets that description. This blue model that I've had for the past 5 years has been nothing less than a tank. Easily outclassing the other XL models I've had.
When looking for faulty N2DSXL, the most frequent problem is cracked upper screen. Not surprising: The panel is supported by weak plastic (and lots of adhesive) only – compared to metal shielding on the other models. The complex replacement of the upper screen makes a crack almost a certain death sentence.
I treat my N2DSXL like a raw egg and NEVER carry it with me (I've no problem taking 3DS models along).
"Lightweight" in electronics doesn't always mean cheap and plasticky. More often than not it means:
* Very thin and vulnerable to physical damage (bending, cracking) in conjunction with bad repairability (adhesives)
* Missing connectors (laptops without Ethernet, but soldered-on RAM)
* Non-user-replaceable battery (standard today; thanks, Apple, for the pioneering work)
Phones: in the early 2000s a phone had to be tiny. So tiny that the buttons became unusable. Having a two year old model delivered: “Why are you carrying that big and heavy stoneage brick? It weighs 110g, while mine only 99g”
With the smartphones we saw the opposite trend. BIGGER each year. Doesn’t fit into a pants pockets. Thank goodness that they become smaller in the third dimension (thinner). That really helps…