I never use fast charging. it kills batteries so freaking fast. Thesedays they're so hard to replace too :|
GSMArena should also test the thermals of the wireless chargin because Qualcomm's QC3.0 already heats the phones for more than 40 degrees C at 18W of power, wireless charging should have higher heat output at full power.
No doubt improving the wireless charging is a good thing especially when majority of the flagships out there r missing the 3.5mm jack.
Good Mi9 supports wireless up to 20W this will be compatible.
Compared to other flagships which barely supports 10W like samsung.