It's a costs / benefits calculation. By simplifying the way that the laptops are assembled, the producers get the prices down near where desktop pricing is. However, part of that is by selling no actual video system, but instead just including an onboard chip that simply cannot handle 3D at all properly/ speedily. The ratio of laptops that can actually play even the less demanding of recent games is worse than one in ten.
The assembly procedures used have made the separate video card into a permanent part of the chassis in the vast majority of the laptops that do have real video cards in them. Fewer than one laptop in a thousand (probably fewer than 25 in ten thousand) are designed for a potential video upgrade, and in every case where that is true that I have ever learned about, the upgrade must be performed by the original factory at a rather steep cost.
Generally speaking, the few laptops offering the option to upgrade are quite a lot more expensive than similarly equipped desktop PCs are, making them uncompetitive.
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