I've noticed that even with an earthed power supply I still have the problem with the newer USB-C MacBooks. I find it rather uncomfortable on my wrists.
A MacBook I had quite a few years ago had a cracked chassis - touching that when using a non-earthed power supply was enough to be a little bit painful.
A MacBook I had quite a few years ago had a cracked chassis - touching that when using a non-earthed power supply was enough to be a little bit painful.