[yellowapple]

> We already have major headaches switching between JS, SQL, and {insert backend language here}.

I used to agree wholeheartedly with this, but now I pretty strongly disagree; in my decade or so of cumulative code-monkeying experience, having to understand the nuances of some "convert $BACKEND_LANGUAGE to JS and SQL" layer has been far more headache-prone than just, you know, writing JS and SQL. All about using the right tool for the job - and I know of very few languages that are the right tool for all three of those jobs (let alone the myriad other jobs that might pop up as soon as you expand beyond a simple CRUD app).