I've read horror stories about incorrect cables, non-brand ones, etc.
My question is, what type-C cable do I need for the Mac M1 charger? (power, quality, etc.)
Some people also said that the non-brands work fine for them. (+ cheaper + longer etc.)
Confused from all readings.
What's your personal opinion?
What kind of cable are you using?
There's no harm in using that charger with your MacBook Air M1.
The Realme Super Dart 65W charger does not "just" output 10V - it negotiates the voltage with the device you're charging. This means that the maximum effect that can be drawn by the device might be less than 65W.
Normally, yes you can. They negotiate and work well. For example I'm using a Lenovo USB-C dock with a 90W capacity and it charges my M1 air with 60W.
I also have the same Realme Superdart charger and it's also showing me 5W charge. It also shows 5.4W outlet power, so it's really only at 5 watts. This means this particular charger can't negotiate a higher charging level.