Back to the Point
Basically the idea is to get Apple to use the same spec as everyone else (USB-C) but this will never happen as they are making too much money licencing others to make lightning connectors or flogging their own at £35 a pop.
it would make everything better if all chargers worked on all devices, but the range of voltages and currents on plugs and cables makes it a nightmare.
most of them are 5v then the ampage changes - 1.0A-4.6A
when you get to QC your looking at up to 20v