Friday
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I’ve always used it, both formally and informally. Especially with the antecedent “One”.Definitely not in the sciences here in the USA. Only colloquially in English, and never formally.
Once one embarks upon blahblahblah they blahblahblah.
One may find that they need to consult...
What are they doing? // Who? // That person there. They seem to be...
But my English is very nearly pidgen between Queen’s, Colonial, & American English... and am of the unwavering position that Editor is a proper noun, and such people are worth their weight in gold.