I can't say I like the server returning portions of HTML that need to match the HTML in the client, but I can see myself trying it in a monorepo and using some templating lib on both sides.
I guess one thing that might be potentially problematic is that if you update the server while someone has the page still open you need to match their original templates version and not the new (potentially incompatible) one
Let's say I'm intrigued and on the fence.