Manufacturers want to make notebooks as thin as possible and yet keep the performance level as close to the desktop PCs as possible. The biggest problem is to cool down the components and lately we are starting to see more external GPU docks, which could be a great solution.
Like Alienware and Razer, ASUS has also unveiled their own external GPU dock called XG Station 2. It allows you to install desktop GPU and connect it to your laptop for improved performance. There is a 680W power supply for the support of AMD's and NVIDIA's latest GPUs. It uses a Thunderbolt 3 connection and ROG's "exclusive proprietary connector" that delivers a further 15 percent graphics performance. The dock can be plugged while the laptop is running. No word on pricing or availability though.