External GPUs have been gaining in popularity ... A prime example of this is the GPD G1 which lets you plug a Radeon RX 7600M XT GPU into an enterprise notebook. At Computex 2024, Sparkle ...
Sure, you could buy an external GPU enclosure that would, in theory, allow you to upgrade to a newer desktop GPU, but then you'd be limited by the connection of the enclosure, which is still PCIe ...