The promo photos of the eGPU include the LG UltraFine 5K, which fully saturates the TB3 port it uses.
Are eGPUs compatable with the UltraFine 5K? IIRC they were explicitly excluded from Apple's compatibility in the early days of High Sierra.
(EDIT: Yes, "There’s even a second Thunderbolt 3 connection for connecting high resolution displays such as the LG 5K display which gives you incredible image resolution, contrast and color depth!")
Are eGPUs compatable with the UltraFine 5K? IIRC they were explicitly excluded from Apple's compatibility in the early days of High Sierra.
(EDIT: Yes, "There’s even a second Thunderbolt 3 connection for connecting high resolution displays such as the LG 5K display which gives you incredible image resolution, contrast and color depth!")