The word "whilst"
This is after all the 21st century. Old fashioned words like those you mentioned don't belong in a 21st century encyclopedia.
We have a need for inclusiveness. We have a need for being friendly to each other because we need to cooperate better. Do you consider that this attitude helps, or polarises people into factions, does it help us with writing a Wikipedia, a Wikitionary or a Wikibooks?
As you have been told, there are people who use these words and do not think twice about them. It is their English as much as yours. Thanks,
George Orwell's Minispeak is a very close approximation of this sort of nonsense. Whilst is not an old fashioned word (sic), and you can say it is until you are blue in the face and it really won't change the reality of the situation for the millions of people who use it. This form of cultural fascism really is quite appalling. Maybe we should call for the banning of the spelling of the word grey? And make every one sing the Star Spangled Banner? I think not.