Call me a conspiracy theorist but as a repair technician that works on phones "wireless charging" is a great excuse to have a glass back on the phone. A glass back that breaks very easily and is extremely expensive (therefore lucrative) to repair.

Most phones (all of Apples) require you to entirely gut the phone with it's dozens of components, screws, cables and many of which are strongly glued in requiring risky prying and pulling. All to then implant all of the components to a new chassis and do it all in reverse.