[mschild]

Guess on my part, but likely cost.

The cheapest egpu case I could find is 300 Euros and that's just the case with an internal PSU. You still need to buy an incredibly expensive GPU to put into it.

So now you're spending probably 1k just for the laptop, plus 300 for the case and an additional, let say, 350-400 on the GPU. For that amount of money, most would probably look for good laptops that have an integrated one, buy a handheld, a console, or just don't want to spend that amount of money on it.