Laptops haven't had an upgrade option for the GPUs in quite a long time; at least five years now, and only Sager offered it for the final couple of years it was available. Games-capable desktop and mini-tower PCs are a lot less expensive in two ways than laptops. The initial cost is less, then the upgrade option gives them longer lives.
Factually, the "initial" video port seen on any stationary PC is only its Intel IGP, so from a gamers' point of view, it might as well not exist. Relatively recent technical improvements allowed some size reductions to the computer cases, so that a gaming system need not take quite the amount of under-desk real estate as previously.
I will say that none of Dell's mini-towers provide adequate internal space for game-playing GPU hardware, save for their overpriced "Alienware" machines.
