It has never occurred to me to recommend a single episode or episodes of a show when I recommend a show to someone. The closest I've come is when someone doesn't want to watch what they know is a subpar season of something (e.g. the 2nd season of Star Trek Next Gen), so I might and have recommended specific episodes because they are key to a character's development or the plot comes back in a later season, etc.

I guess it would be OK to recommend "best episodes" of a "case of the week" type of show. But most of the shows I watch aren't that, so recommending Severance to someone by saying they try ep 7 of season 2 would just be totally daft.

I might suggest they skip an episode that I thought was really subpar and just read a plot summary instead, but that's a different sort of thing.