Users also cannot use external GPUs on Windows via Boot Camp. And using an external GPU on a macOS doesn't mean you can do anything because the developer must support it too.
Finally, there will be a new Mac to the extent needed because the external GPU relies on super fast speed thanks to Thunderbolt 3, ie MacBook Pro 2016, 2017 and iMac Pro.
Anyway, if you have a new device and are using a supported application, this is fine, because external GPUs, which are not on the Mac, are very popular in the gaming community.
One of the benefits of Thunderbolt 3 is to increase such flexibility. Just spend a few hundred dollars more, now the compact Mac that comes out is still strong enough for high-demand tasks.
The benefits of eGPU offered by Apple include:
The recommended graphics card list is AMD Radeon RX 570, RX 580, Radeon Pro WX 7100, AMD Radeon RX Vega 56, AMD Radeon RX Vega 64, Air Vega Frontier Edition, Radeon Pro WX 9100.
Read details about eGPU on Mac here.https://support.apple.com/en-us/HT208544
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