Really shocked reading that article. For the money Apple charge they could at least supply a power block to take advantage of the fast charging capabilities. Samsung have done that for years now.
Saying that I bought a GPD pocket not long ago, and using an external Anker block via USB-C makes a fair difference to the charge time. Mind you GPD are a small Chinese manufacturer and not a global Corporation like Apple.
Shame on Apple for still bundling an obsolete 5W charger with any phone, never mind those that cost £1000!
There is unsurprisingly a significant difference with the 30W charger I use with lightning cable. The two coil wireless charger I used with my Nexus 5 isn't bad either.