I wasn't at this conference, so I have very little context. Normally, I'd consider it a sin to weigh in on a subject brought up by looking at two out-of-context slides, but I'm only weighing in out of interest and to continue the conversation.
So if you have...
...and you need to apply an event listener to that article for some reason, then don't use...
(or querySelector or whatever, I assume.)
Seems reasonable to me.
Also seems like there is plenty to talk about here. Performance, I suppose, but that's probably the least-interesting thing since selectors are generally pretty damn fast these days. We could continue the conversation by talking about:
What naming convention?
Should you be naming events?
What if it needs to be selected for different reasons multiple times?
Can you or should you use IDs?
Is it worth avoiding DOM selection at all if you can?