I don't think anyone can blame Virgin on this one. Their supplier doesn't have anything better, really.
https://www.commscope.com/product-ty...1#ProductsList
They don't offer a hub with 2.5G ports. They have some 3.1 modems with a 2.5G port, but those aren't gateways (Hubs). The majority of Virgin's customers use the hub without an external router.