1) if the electromagnetic radiation is emitted highly in a wireless charger can have harmful and negative impact  on human body.. But most of the wireless chargers use a little amount of electromagnetic radiation which is effect less for human body. So you need to varify before purchasing .

2) Using a low quality and not compatible charger can damage your phone’s battery…

3) It’s costly and needs much time to charge fully. It needs high investment…

4) It’s not compatible for every models of phone.

5) If you r a busy man and prefer fast charging it’s not appropriate for you..

6) It’s also big and heavy to carry. .

Everything has good and bad effects. It’s up to what’s more useful to you and less harmful too.