Is SDO needed? Which functions actually read data

I like to use a display which uses a ILI9488 driver. But the SPI is shared with some other devices. I read that the ILI9488 does not put SDO in high-z state. So my plan is not to connect the SDO. It seems to work fine with the few examples I tries so far. But will I get in trouble some time later when trying other functionality which might need to read data from the display? Or does the library not read data at all?

LittlevGL does not read any data from your display.

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Thank you for the reply.