One of the things that makes this a big deal is an iPad is often the most color accurate highest quality display anyone has.
You don't realize how extremely off consumer monitors are until you compare it to a calibrated one like the ipad.
Even the factory calibration on every single Mac in my house (there are several, including a brand new M1 Air) has been notably off until calibrated.
The unfortunate thing about the iPads is that though they cover the DCI-P3 space there is no way to calibrate them. My Pro is significantly off my calibrated iMac and Air.