I've not used it myself, but https://htmx.org/ https://htmx.org/ combined with a traditional web framework like Django or Rails seems like it should greatly red

I've not used it myself, but https://htmx.org/ https://htmx.org/ combined with a traditional web framework like Django or Rails seems like it should greatly reduce the need to triplicate logic. At least for apps where the UI needs to be good enough rather than as good as possible.