Is SDO needed? Which functions actually read data

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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?

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LittlevGL does not read any data from your display.

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Cool.
Thank you for the reply.