It’s really like a style of clothing: a sort of old man’s suit that looks normal in academic institutions but in most other settings you do look like you’ve just come from that institution.
The typesetting is much better than anything in common (non-design-professional) use though.
On the flip side of the coin, I would say don't attempt to customize it. LaTeX out of the box is essentially what you need for an easy to read document.
There is no LaTeX graphic designer out there. I would agree to a little defeat and say the poster example on that website looked bad. If customizability is something people are looking for LaTeX is not the ideal choice because the learning curve for advance use can be incredibly steep, you may not have a good eye for good graphics if you are using LaTex in the first place and you might compromise early and say good enough.
Seriously, TeX is a bad maths language [http://xahlee.info/cmaci/notation/TeX_pestilence.html], surrounded by a terrible document markup language, wrapped in tooling straight from the 1980s, plus a community only too willing to tell you how your question is wrong.
Have you looked into Groff >> https://tex.stackexchange.com/questions/527864/latex-vs-grof...
I have heard atleast one people say that, the math syntax is much more elegant in groff as opposed to LaTex.
Been there, experienced that. Like this one poor guy who dared to ask at the TeX.StackOverflow help desk—"what can I do to get this and that vertical line in my table", only to get lectured by one acolyte, "Oh noes, don't, vertical lines bad, only horizontal lines in tables, proven to be the only way to go". Which totally throws centuries of finely typeset mathematical, astronomical and nautical tables out of the window while not answering the question.
To be fair, there are quite a few people on the TeXSO that go to incredible lengths to give extensive answers—expositions really—to hairy questions ('hairy' being a technical term here which translates to 'daily' in the context of TeX).
There are still huge conceptual leaps to be made in the notion of a computer as a document creator and content rendering, and Smalltalk provides some clues in that direction, though I doubt we'll see it in my lifetime, considering the weight of the last twenty-five years will make it difficult to change course.
The relevance of the above flight of fantasy to your point is that LaTeX, for all its awkwardness, is absolutely a local maxima in document creation, and I love seeing its results appear from the markup, knowing that it's following the numbers precisely, as if by magic, and print them out and marvel at the quality of the fonts close-up, and we need more such systems with which to create and render content, before denting the DOM+CSS hegemony in the manner I described above.
Also, those are naturally usable offline, are durable and have no interactive annoyances.
MHTML (aka .eml) is usable offline too (except for some reason by Firefox ?!?), while PDFs are horrible on screens smaller than the width of a page.
I'm not sure what interactive annoyances on scientific websites you're talking about - the most problematic ones these days are those with the assumption of a working Java or Flash plugin (and if they start to be plagued by irrelevant scripts it's much easier so far to block JavaScript in a browser than in a pdf reader), meanwhile many pdf readers don't even have any animation support, which is about content rather than presentation ! (As a metaphor : would you support a format unable to show pictures ?)
I added DVI rendering to NCSA Mosaic in 1994. Didn't go down well with anyone. Probably a good thing overall, but I still think it was a nice idea (multiple different renderers).
Please open any of the publications in https://www.texmacs.org/joris/main/publs.html (pdf versions) and then get your own opinion on whether anything else is crisp ;-)
I saw "France" at the top of the document and I quickly scrolled the document thinking, "Looks crisp French to me."
Then it dawned on me.....