Oh sure you are. HTML = Structured textual content, key word being "content".
A textbook or a manual can be written in HTML, and you use that for a
practical job.
This is more or less semantics though, and obviously I agree there's no need
for libreHTML.
Well, in an ideal software world I'd agree, but the simple fact is the world
isn't all that ideal, and at some point ones has to compromise.
For instance, most of us agree that a non-free bios is an acceptable
compromise in a computer, maybe partly because the BIOS is an old relic that
can't really do too awful much. In contrast to, say, UEFI or Intel vPro,
which I think we can all agree to avoid like the plague.
That said, of course I agree with the principle, and I personally use
NoScript for that exact purpose, and I would advise any power user to do the
same, but that's a whole other thing from making it the default for everyone.
As an example, when I set up the browser for grandma, it was JavaScript and
cookies enabled, and gnash and java disabled, along with adblock.
Which to me seems like a reasonable compromise for maintaining functionality,
at least for now.
Maybe I'd do this differently if there was a good whitelist-based solution
out there.