[hackmiester]

You are correct, but the comment didn't say "fast chargers," it said GaN.

Here is a (very cute) 35W GaN charger. This would be considered fast charging for a phone, but not for a laptop. https://sharge.com/products/shargeek-retro-35-gan-charger

It is just plain inaccurate to state that GaN is the problem, or opens up new possibilities for fast charging. All it does is make the charger smaller.