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.