I use fennec from F-droid on mobile

Of course they can:

USB -PD support at limited speeds.

A proprietary Apple chip enables higher speeds, either using USB-PD still or another proprietary charging protocol.

They can just have both

At least then there will be no more confusion over who’s fault it is when your iPhone doesn’t charge as fast as you’d like.

It’s always been Apple’s fault, but now there will be no more saying it’s because Lightning is somehow better.