It depends on the language and codebase. For something very dynamic like Python it may be the case that grepping finds real references to a symbol that won’t be

It depends on the language and codebase. For something very dynamic like Python it may be the case that grepping finds real references to a symbol that won’t be found by a language server. Also language servers may not work with cross-language interfaces or codegen situations as well as grep. OTOH for a giant monorepo, grep probably won’t work very well.