[dcow]

This one honestly reads more like a “we fucked up let’s call it a feature in an obscure technical amendment”.

[cwizou]

You'd be surprised, this is how most modern "high end" Intel laptop actually works. Even some Intel Macbook Pro exhibited this.

This is 100% an Intel thing.

[errantblaze]

Another possibility is cost reduction as these are lower-end models. At least some of higher-end models (G7 and Alienware) have 180W and 240W power adapters, instead of the 130W included with this model.