[rasmus-kirk]

I think it's a leftover before proper LSP's, if you had to type/paste everything, that would be fairly tedious, but now-a-days everyone uses LSP's with autocomplete that have all the variables in scope.

I do think very long names can hurt readability though so it's still a balancing act, but variables like "t" (often used in Haskell, ugh) is awful in my opinion.