Language changes over time. By the time EVs are mainstream, chargers will likely be the correct and widely accepted term for it even if the engineers want to call it something else. When someone goes to the doctor and says their finger is stuck up their nose, some might stop and think to say nostril to to be more accurate. If they say nose, it really doesn't help for the doctor to get offended and correct the person or to point out that apparently the truly correct term would be naris. (As I'm not a doctor I'm working off a Google search for this so don't get on me if I don't have that term right either).
Engineering terms of multiple words that get reduced to acronyms sometimes take off and gain general acceptance, e.g., RADAR. EV might make it but ideally simply car or auto will convey an EV eventually. EVSE is not as likely especially when for most people's use, charger will clearly get the idea across and is more natural. And that is the thing about language; it evolves over time based on how it is used in society. And from the looks of it thus far, charger is winning over EVSE or 'electric vehicle service equipment'. Seriously, who thought that 'electric vehicle service equipment' would work in the mainstream?
Different forums have different audiences. I would expect a medical journal to use more accurate terms like nostril or naris. I would expect an engineering forum to use EVSE. But for forums aimed at the broader consumer, which I believe InsideEVs and MyNissanLeaf to be, either is acceptable except for those times where the nature of the discussion really warrants the specificity. The above posts have a few examples of where that clarity is needed. But it seems to me that most of the time charger works just fine.