with JSON, frontend devs can ignore chunks of it, or work with the backend devs to modify the payload.
HTML, being a representation of a desired state rather than a neutral information exchange medium. is tricky to do that with. the frontend and backend devs would have to remain in lockstep with any changes made to the payload, ie the frontend and backend applications become tightly coupled.
I don't really see how having front end devs hand off a spec saying "we need this exact result format" is better than a loosely coupled result in a standard format
In a team where the backend devs can't work with the HTML templates for whatever reason, the frontend devs would be directly managing those.
I definitely wouldn't ask my frontend dev to write a spec and hand it to me to make their template, the spec spec would effectively have to be the template source code anyway. Just get in there and work with the HTML templates themselves.
HTML, being a representation of a desired state rather than a neutral information exchange medium. is tricky to do that with. the frontend and backend devs would have to remain in lockstep with any changes made to the payload, ie the frontend and backend applications become tightly coupled.
I don't really see how having front end devs hand off a spec saying "we need this exact result format" is better than a loosely coupled result in a standard format