Hello,
There is no an specific reason about why this module was removed on i.MX8 and i.MX9 families. I think these processor families does not meet your requirements but, other option could be some Layerscape processors that includes USB 3.0, Gigabit Ethernet and an Integrated Flash Controller module to interface x8-/16-bit devices.
For example: Layerscape 1043A or1023A.
Best regards.