being good at software design isn't about memorizing the specific details of a single language or subjects

languages are subject to change

hire people who are good at finding information

not someone who is good at blindly memorizing details of a specific instance of a language or system

someone who memorized every single detail of COBOL will be a worse coder than someone who spent time thinking about abstract thinking and problem solving

you'll want to double check everything anyway

this shows of a fundamental lack of insight into what it means to be a good developer

it's like someone who thinks they are smarter than everyone else because they spent thousands on hours on playing chess

this student who has memorized the full specification of HTML, CSS and Javascript will be useless if you ask them a question about lets say Erlang, and is easily replaced by a book