In terms of serious Mac audio issues, when I got my new M1 MBP I quickly noticed a faint crackling sound (unaffected by the volume setting) in the headphone jack when plugged in via MagSafe or a left side USB port. So I just have it plugged in to power on the right side instead.
Other people have reported it too, so it's not just a one-off defect. I know electrical engineering is hard, but it's a really annoying problem to exist on a super expensive laptop.
Haven't noticed it affecting the audio, but you can definitely feel the grounding issue when touching the back of a charging MBP. You get a tingling / bumpy surface sensation. I've seen people complaining about getting actual shocks for it though.
M1 MBP's only come with two prong chargers, except in markets that use the British plug. Depending on the cause of the issue grounding could help, but you'd have to buy an extension cord with a ground.
Yes, I have a few 'san francisco special' ungrounded power tails but to my knowledge they were only made during the PowerPC era and did not continue into the Intel era.
e. oh grounded short adapters. I wouldn't go for that due to the wall wort issue. I usually swapped out my apple bricks to grounded tails because it was usually easier to work into whateve ad-hoc power I encountered.
Other people have reported it too, so it's not just a one-off defect. I know electrical engineering is hard, but it's a really annoying problem to exist on a super expensive laptop.