Building a public API and having your frontend consume it is quite easy and would result in a decoupled design. "But then the frontend is 'coupled' to the back

Building a public API and having your frontend consume it is quite easy and would result in a decoupled design. "But then the frontend is 'coupled' to the backend!" you might say, but you would misunderstand the definition of "coupled," as both the frontend and the backend would need to be connected together for that term to apply.