The problem with that is that while the display is updating which can take some time depending on bit depth and resolution, you can't use the ADC, It may or may not matter depending how fast you need to read the ADC.
I'm using DAC and ILI9341 on 2 SPI busses on teensy 4.1 (and the optional psram with qspi) The display uses ILI9341_T3n which controls it's own bus, and the DAC is controlled with SPI library. they work completely independently without affecting each other's speed.