What happened to good ol' classic periodic code reviews? Instead of either the inefficiencies of having everyone work together or having everyone get a review o

What happened to good ol' classic periodic code reviews? Instead of either the inefficiencies of having everyone work together or having everyone get a review of every single incremental change to the code base, you let everyone work at maximum efficiency and then do periodic batch reviews and education sessions. Does this really sound so old fashioned that we have to instead invent new ways of being less efficient, lest one of my supposedly-adult coworkers even momentarily commits a mistake to the codebase?