The most powerful GPU that you can hope to manage with TB3 is a GTX 1060. The bandwidth will simply bottleneck anything else too hard. Remember, you're dealing with a PCI-E Gen 3 lane at x2 speed. The most you can hope to get outta that is maybe a 1060.
But the problem is that you seem to think that you are correct that it is the best GPU to use.
Some people just want a convenient solution where they can take a computer with a fast CPU to school to use for productivity like compiling applications and related tasks, and when they get home they can drop into Windows and game. That is why I have an eGPU and I can imagine that's the reason a lot of people have one as well.
Who says that it's only gaming laptops that have TB interfaces? Because that's very, very wrong.. Zbooks are business machines used in production for movies and related content around the world. The MacBook Pro 15", as much as it is a warm running housefire with a fucking huge touchpad and a shitty keyboard, is one of the best selling laptops to various people, and the Touchbar is fucking cool (but kinda useless).. Yet both of these machines come with GPUs that aren't really that powerful (no offense AMD, the pro 555 isn't a good chip).. why not add to the power with a nice eGPU for use at home?
You've got an unrestricted quick PCI-E x4 interface with very little interference (that's why TB cables are an arm, leg, and a left kidney), why not use it to the fullest?
