Earlier quoted context omitted.
I use my laptop charger for my phone all the time. May I ask what has you scared to do so, because you have me concerned now.
USB-C charging relies on negotiation between both sides. A laptop charger can supply 20+V if it determines there's a high-power device on the other end. I'm not particularly trusting that a cheaply-made power supply won't hit the wrong condition on a case statement and supply 20V to my phone. Implementing USB-C wrong seems to be a passtime of all major manufacturers now. Nintendo got it almost completely wrong with t…
https://www.theverge.com/2015/11/5/9674462/usb-type-c-google... is dated coverage of a Google engineer testing for out-of-spec cables. See also: https://twitter.com/laughing_man.