What's stopping everyone from adding wireless charging? Google and Moto had it and dropped it. Apple added it recently. Etc?

Qi adds weight for coil and shield, and limits what material can be used for back surface that's also tend to add weight. For example, iPhone 8 added Qi and switched back surface material from aluminum to glass. 7 Plus is 188g then 8 Plus is 202g. It's not easy decision to have Qi for lightweight oriented device.

> iPhone 8 added Qi

Are you sure? My wife has an iPhone 8 and it doesn't charge in our car which has wireless charging in the phone tray.

Yeah, perhaps your case don't support Qi, phone coil isn't placed on your Qi tray coil, other metals is on Qi tray so it's stopped for safety, or something goes wrong...

This is really bothering me too, as there's been a couple phones released lately that are as close to perfect for me as I'll get, but no wireless charging is basically a deal breaker for me.

I think maybe it's the resurgence of metal frames on lower priced phones, which maybe doesn't work as well as glass or plastic.

Which is also annoying because I despise glass as a back surface for phones. Makes them slide off every surface.