Webdev shifted from making pages of content with some interactivity to web apps that live and maintain state on the client and occasionally query backend for so

Webdev shifted from making pages of content with some interactivity to web apps that live and maintain state on the client and occasionally query backend for some data. You don't need or particularly benefit from modern JS frameworks for somewhat interactive pages. But you absolutely can't do web apps with ad hoc jQuery and maintain your sanity.