Is it okay to use non-OEM USB-C cable and/or adapter for Macbook Pro?
A USB-C cable is a USB-C cable.  There's nothing special about it with the exception of quality (which you already mentioned.)

As far as adapters go, there are "genuine" adapters which are actually OEM'ed by a 3rd party company with Apple's blessing and then there are the myriad of knock-offs you can find on Amazon and eBay.

If you are using the USB-C charger/port to charge your device, technically speaking, any cable/adapter will do.  That said, when you purchase said cable/adapter, look for quality products, not the cheapest you can find.

What to look for...


A USB-IF compliance. This means it was tested to meet a certain set of standards.
USB certified Charger Logo.  This means that the charger is USB-IF compliant.




Does this mean that the no-name or off-brand products are bad?  No.  It means that the manufacturer has taken the time and cost to certify their products to a certain level of quality and performance.  (IMO) Saving a few dollars on a cable/charger is simply not worth it when attaching it to a $1000+ Mac that I use for daily work.