It sounds like you have researched it properly, but on the off chance that you have missed it (there has been a few misunderstandings around too), I figured I would mention this:I said I needed to upgrade my 10Gbit NICs to support ESXI 7.0. This is because they are using the old ixgb driver, which is not supported natively in ESXi 7.0.
Unless you have the really really old (AFAIK 1st gen Intel 10g, based on the 82598 controller) cards, your Intel NIC is probably supported on ESXi 7 with the ixgben driver.
This includes the ever popular and also quite old X520 card and its like that use the same controller (82599).