I actually like htmx (I find Unpoly superior so that’s what I use, but it’s the same general idea) and the example given makes sense, but one should not extend locality of behaviour to the point of sprinkling SQL in templates. I don’t think that’s what the htmx folks had in mind in this essay either, their canonical example being the html/css/js trio. But hey… there’s no better experience than first-hand experience, you will find soon enough if it works for you.

I agree that it's taking the idea of LoB to an extreme that wasn't intended (at least not explicitly) in the essay. But I still don't see why it's a bad idea considering that SQL-level abstractions (views, procedures, etc) are available. What value does adding a layer of application-level abstraction provide? So I have to name and call a function that calls the sql; to what end?

There’s plenty of literature (and debate !) about mvc/mvt (and its numerous variants and interpretations) in the context of web apps. It’s interesting that you challenge the consensus though.