Yes, well, I see your point regarding it being confusing for some, it will of course need a detailed explanation and clear and visible indications on the sensor and board. I have faith in the user 
The thing is. One of the ports/sides will be routed to headers on the Powerstage. I need to limit the pin_count on those dual_row headers. So the SPI interface will be standard. If the user wants SPI and ABZ interface, that’s possible using jumber_wires from the Powerstage (ABZ output header) to the MCU stack. Pure ABZ is also possible if the user need the other SPI port for something else.
So if for example the ABZ interface is not on the SPI pins (like the STSpin32G4) if using a MCU stack with a different MCU, then the user has SPI as standard, but also the possibility to interface the ABZ.
I dont remember how it is for the STM32H7…