Re: The Ryanair model
"But phone chargers? Most people now have loads"
Well, sort of. I have quite a few standard 0.5A USB chargers. I think I have two that support some sort of fast charging, but only the early generation type that is nowhere near the 20ish W of more modern standards. I have zero USB-C cables or anything capable of supply relevant amounts of power through them. I have a variety of cables with either mini- or micro-USB connectors rated for a variety of different powers, some power only, all unlabeled of course.
Sure, it's possible to buy them separately, but when buying brand new things costing hundreds, potentially thousands, of pounds, there's an awful lot to be said for making sure it's actually usable out of the box. If I buy a shiny new phone, I shouldn't have to worry that I'm not actually able to charge it, and I shouldn't have to do research to figure out what I actually need to be able to do so. Providing the basic equipment needed absolutely should be part of the package.