Soldato
The i7-5775C with its Iris Pro Graphics 6200 and the Ryzen 5 2400G with its Radeon Vega 11 Graphics
are APUs and their graphics performance is decent enough to make people want this additional acceleration, for example on top of their usual RX 550, RX 560, RX 570, RX 580 and GTX 1050, GTX 1060 discrete graphics.
This acceleration in itself can add frame rates to make the difference between unplayable and playable experience in a given scenario.
The i7 made a lot more sense to pair with discrete graphics card because the L4 cache it had on die could be used when using a discrete card as well. This meant better performance than skylake in certain games.