I’ve been flying in the industry for well over 20 years now. I have been employed by two of the biggest airlines in the world and not once have I experienced such an event nor have I had any of my flying partners ever mention one of them to me. Lucky???? Perhaps.
The you tube video in the link shows an obvious mechanical problem (smoke incident) with the aircraft. Something that is far from normal and a very rare occurrence.
I honestly don’t believe this to be anything that a normal flyer needs to worry themselves with.
Unless you are on a Boeing 787 dreamliner…..just kidding!