Jinja2 is better, but most of the time, I would just build the API and not bother with rendering anything on Django itself
Do you mean having a javascript templating system maybe? Not really worth it's weight in gold.
Ruby example that Github is using: https://viewcomponent.org/ https://viewcomponent.org/viewcomponents-at-github.html
Plus if your frontend is react, it’s much easier to keep all the html generation in one place.
It was better in many ways than the dominant techniques in 2013, sure, but that's not a terribly high bar, especially when observing the React model a decade later.
React served well enough for quick starts. It proved… challenging… for ongoing maintenance and quality control in long-lived projects.