They still do. My m1, m1max and m4max Macbook Pros all build a positive static charge. It isn't even something that renders it "returnable" because I observed it on every single Macbook in the last 4-5 years so I just assume that's just how Macbook Pros are now.
This hasn't changed in at least 2 decades: I was getting zapped by Apple metal laptops circa 2004. But I have never encountered this problem when using a grounded plug.
It was also a lot worse for me when plugged into outlets in an old house in Mexico, especially when my bare feet were touching the terracotta floor tiles; it's not really an issue in a recently re-wired house in California with a wood floor, using the same laptops, power strips, etc.
If you are having this issue and you currently plug a 2-pronged plug into a grounded outlet, try using Apple's 3-pronged plug instead, and I expect it would go away. If you don't have grounded outlets, then that's a bit more complicated to solve.
That's what confuses me, I am using the cable with three prongs, it is grounded. I am beginning to suspect some other appliance I am plugging into it that is responsible of the build-up of charge, but then why is it not finding its way to the ground... something doesn't add up but has been my experience consistently.
Perhaps the outlet isn't properly grounded?
Is there any laptop with a metal body out there that does not have this issue? I've had two RedmiBook by Xiaomi and both has that vibrating electric feeling to them when plugged in.
It's an artifact of the charger.
This comment explains it well: https://news.ycombinator.com/item?id=45686427