Yes, the electrical shocks are very annoying! I don't know if it's related to an older/failing battery but I've certainly noticed this on an old Macbook Pro. Thanks for mentioning this - I guess at 24VDC it isn't a regulatory issue but it really does feel like a small insect sting or something and it's irritating.
My newer Air doesn't seem to have this problem. Also the screen is brighter, together with a mat finish it is better for using outside.
It happens new too, and it's not the DC side of things. The AC -> DC component has some AC leakage, and the default of bad two-prong charging blocks basically guarantees you'll have issues.
I normally "fix" it by using a USB-C charging brick and cord from a better company (somehow they're all fine even ungrounded), but the factory default is bad.