The point isn’t to erase the need for JavaScript entirely, but to make it possible to integrate and interact with a backend in a meaningful way using just mainly html.
It's enough to read the context of the discussion, don't you think?
Original complaint: "it's describing a "whole other language" they call Hyperscript"
Response: hyperscript is a completely separate technology. htmx generalizes hypermedia controls, that's pretty much it, and it can be used with any scripting tool you'd like
My response:
In reality [1] htmx defines its own non-optional DSL that you have to use.
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I will add that as with any organically grown nice-to-have utility DSLs it's quite haphazard (it's hyperscript-like in one place, js-like in another place, both in some other places etc.). But that's the nature of such ad-hoc informally specified DSLs
[1] which can be easily verified by just visiting https://htmx.org