[CydeWeys]

The Nexus 5 had both wireless charging and a non-glass back, along with plenty of other phones.

And even if they were somehow mutually exclusive, I'd still take a non-fragile back over the ability to wirelessly charge.

[kusha]

I don't think Apple would ever have a plastic back on a premium device. The Nexus 5 back was not "premium", it was a soft touch plastic.

[luvbb]

I think the key for wireless charging is a not-metal back. Glass or plastic would both work.